Mr.Sniff

Ok thanks, I'll take that into consideration.

For the primary build, I would consider waiting for the new Ryzen chips coming in July. Otherwise for a keyboard, personally I would grab the Logitech G413 for $70 USD due to it's longer life key Omron Romer G switches, despite the fact that it only comes with a red backlight.

The ViewSonic is the best out of the ones you listed. I would check out these monitors: https://www.rtings.com/monitor/reviews/best/budget-gaming
 
rtings is the best monitor review site in my opinion.
 
i look for brightness of above 300nitts, actual (not advertised) response time of less than 7ms, and VA or IPS panels. Though, at $200 you are probably going to be going with a TN panel.

what games are you planning to play?
 
ED one is curved so white uniformity and balance will be horrible. 
ED is VA panel so color is better but latency is worse. 
 

its your decision. do you care about color accuracy? for such a small screen size, i would highly reccommend against curved panels because it is unnessesary. if you do not sit directly in front of the screen and at 0 degree angle, things will get warped and look weird. 

This build should do quite nicely for game streaming within your budget.
PCPartPicker part list / Price breakdown by merchant Type Item Price CPU AMD - Ryzen 7 2700X 3.7 GHz 8-Core Processor $294.99 @ Amazon Motherboard Gigabyte - X470 AORUS ULTRA GAMING ATX AM4 Motherboard $119.89 @ OutletPC Memory G.Skill - Ripjaws V Series 16 GB (2 x 8 GB) DDR4-3200 Memory $94.99 @ Newegg Storage Intel - 660p Series 1 TB M.2-2280 Solid State Drive $109.99 @ Newegg Video Card MSI - GeForce RTX 2080 8 GB VENTUS Video Card $699.99 @ Newegg Case Corsair - Carbide SPEC-04 (Black/Red) ATX Mid Tower Case $39.98 @ Newegg Power Supply SeaSonic - FOCUS Plus Gold 550 W 80+ Gold Certified Fully-Modular ATX Power Supply $79.99 @ SuperBiiz   Prices include shipping, taxes, rebates, and discounts     Total (before mail-in rebates) $1474.82   Mail-in rebates -$35.00   Total $1439.82   Generated by PCPartPicker 2019-04-07 16:56 EDT-0400   All of these parts are available on Amazon, albeit at a slightly higher price.

Which is basically the same thing as Optane on Intel's side. Both are largely gimmicky crap. They're just glorified versions of ReadyBoost in my opinion.

ED for freesync will be the superior experience.

There is Vega 64 nitro+ that rivals the 2070 if you do some optimization 

Get the ED242QR instead, the panel is much better and it supports freesync for better smoothness in games.

More FPS for less money. And the threads aren't mattering much in gaming. Even in Assassin's Creed Origins (which uses 12 threads) the 9400F still matches or beats the 2600x depending on the benchmark you're looking at and it has 6 less threads. It also wins in Far Cry 5 which uses 8 threads even though it has 2 less threads. That's a marker for future performance, meaning its thread advantage won't be useful in most games even down the line.
 
You absolutely need a Z390 for the 9400F for a few reasons.
 
1) The B365 board can only use up to 2666MHz RAM. The 9400F experiences gains of up to 16% by stepping up to 3200MHz depending on the game.
2) It provides an upgrade path to the 9700K and 9900K where the B365 board won't handle those CPUs due to way worse VRMs/power delivery.
3) It provides the ability to overclock where the B365 board does not if the user chooses to move onto any K-SKU CPU.
4) The Z390 is only $17 more than the B365 board, giving you the above for very little money more. Z390/B365 are the only chipsets to support 9th Gen Intel out of the box which is why other chipsets are not being considered. 
 
Finally remember that the above is the 8400, the 9400F will get more like 9 FPS more instead of 7 FPS more. At 109 FPS vs 100 FPS that's a 9% gain for $10 less.

Save a few dollars more and get even better gaming performance:
 
PCPartPicker part list / Price breakdown by merchant Type Item Price CPU Intel - Core i5-9400F 2.9 GHz 6-Core Processor $174.89 @ OutletPC Motherboard Gigabyte - Z390 UD ATX LGA1151 Motherboard $119.99 @ Amazon Memory GeIL - SUPER LUCE RGB SYNC 16 GB (2 x 8 GB) DDR4-3000 Memory $84.99 @ Newegg Storage Intel - 660p Series 1 TB M.2-2280 Solid State Drive $109.89 @ OutletPC Storage Seagate - Barracuda 2 TB 3.5" 7200RPM Internal Hard Drive $59.88 @ Amazon Video Card MSI - GeForce RTX 2060 6 GB VENTUS OC Video Card $350.00 Case Phanteks - ECLIPSE P400S TEMPERED GLASS ATX Mid Tower Case $89.99 @ Amazon Power Supply Cooler Master - MWE Gold 650 W 80+ Gold Certified Fully-Modular ATX Power Supply $74.99 @ Amazon Operating System Microsoft - Windows 10 Home OEM 64-bit $106.05 @ Amazon Monitor Acer - GN246HL 24.0" 1920x1080 144 Hz Monitor $179.99 Other Samsung 32GB BAR USB 3.0 Flash Drive (MUF-32BA/AM) $16.99 @ Amazon   Prices include shipping, taxes, rebates, and discounts     Total $1367.65   Generated by PCPartPicker 2019-04-18 00:08 EDT-0400    
Here's a few examples out of dozens. The 9400F beats out the 2600x even when it's OCed:

550w is enough, i just picked the 650w MWE since it was the same price as other similar quality 550w units.

@Mr.Sniff Yes, Bitfenix.

Also:
 
I wouldn't recommend P350X as H500 is the same price and performs better
I would still recommend a Formula over a MWE Gold. Same efficiency != same quality

PCPartPicker part list / Price breakdown by merchant
CPU: AMD - Ryzen 5 2600 3.4 GHz 6-Core Processor  ($164.89 @ OutletPC) 
Motherboard: MSI - B450-A PRO ATX AM4 Motherboard  ($99.97 @ Amazon) 
Memory: GeIL - SUPER LUCE RGB SYNC 16 GB (2 x 8 GB) DDR4-3000 Memory  ($84.99 @ Newegg) 
Storage: Intel - 660p Series 1 TB M.2-2280 Solid State Drive  ($109.89 @ OutletPC) 
Storage: Seagate - Barracuda 2 TB 3.5" 7200RPM Internal Hard Drive  ($59.78 @ OutletPC) 
Video Card: Gigabyte - GeForce RTX 2070 8 GB WINDFORCE Video Card  ($479.99 @ Amazon) 
Case: Phanteks - Eclipse P350X (Black) ATX Mid Tower Case  ($69.99 @ Amazon) 
Power Supply: Cooler Master - MWE Gold 650 W 80+ Gold Certified Fully-Modular ATX Power Supply  ($74.99 @ Amazon) 
Operating System: Microsoft - Windows 10 Home OEM 64-bit  ($106.05 @ Amazon) 
Monitor: Acer - ED242QR Abidpx 23.6" 1920x1080 144 Hz Monitor  ($169.99 @ Amazon) 
Other: Samsung 32GB BAR USB 3.0 Flash Drive (MUF-32BA/AM)  ($16.99 @ Amazon) 
Total: $1437.52
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2019-04-17 22:29 EDT-0400

you don't need the 2700 for gaming, the 2600 will do. use the money for a 144hz monitor instead, the 2070 will be completely wasted on a 60hz 1080p monitor.

If you are just gaming, go for a 2600. Also, I would change the case to a Meshify C for that price, as well as the PSU to a Formula Gold. Other than that, I'd say it's fine.

Well, it doesn't mater how many threads it has. It only the performance that matters. If those threads don't make it superior performer, then it doesn't matter that they are there. I know that Jerubedo likes the 9400F, and I do too, and I rate it better than a non-overclocked 2600. An overclocked 2600, or a 2600X, might be just a little better in my thinking. You have to look at a lot of testing, not just one person's test, as all the tests are a little different.
 

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A few posts ago I had recommended switching over to the 9400F from Intel for a lower price, better performance, lower power draw, and lower heat output. The 9400F will work on both B365 and Z390 boards, but I would never recommend B365. So that's where it came from Sorry to confuse you!