peep

Since your budget seems to be around $500 I'll recommend these. I'll also add the GL850 for easy comparision. Rtings has not reviewed the Acer you're looking at.
https://www.rtings.com/monitor/reviews/lenovo/legion-y27q-20
https://www.rtings.com/monitor/reviews/asus/tuf-vg27aq
https://www.rtings.com/monitor/reviews/gigabyte/aorus-fi27q
https://www.rtings.com/monitor/reviews/lg/27gl850-b
 
27" G7 has also been on sale for around $500, so you might want to check if it's on sale.
https://www.rtings.com/monitor/reviews/samsung/odyssey-g7
 
And lastly I would recommend you read our sticky as it helps you to understand the reviews better.
 

I have the exact same problem (even same mobo planned lol) and i think what i've decided is that im going to stick with the B450-A PRO MAX and not buy a adapter, but if i get annoyed by not having it after a couple of months, i'll get an adapter, which are like $20 on amazon.
 
here's a link to a forum post with mobo recommendations if you do decide to spring for a mobo:
 

Just see the USB Type C port on the case as a faster and differently shaped USB port.
Probably not worth it today, maybe worth it in the future?
Anyways, you would need to move up to an X570 board like the Aorus Elite.
 
Is this worth it though? IMO, you're better off spending that 100 USD difference in getting a better videocard, rather than this different motherboard.

It might get an update to support it in the future, though that would be free-sync over HDMI...
 
Otherwise they're just good displays for the price, and it shouldn't cost anymore than displays without free-sync.

if you need it, i would get a nvme. honestly sata ssd is fine.

If you NEED more storage than you have in your computer, then buy more storage. Otherwise, stick with what you have. 

They are not. If you are going with Corsair, buy their case preferably with integrated RGB and Fan controller support 
something like this
https://www.amazon.com/CORSAIR-Crystal-Mid-Tower-Tempered-Glass/dp/B01LE0ZKR2/ref=sr_1_5?ie=UTF8&qid=1539280383&sr=8-5&keywords=corsair+rgb+cases&dpID=41zBcM%2BLYFL&preST=_SY300_QL70_&dpSrc=srch

What is your budget? I personally like cases by Fractal Design. Meshify C is a good choice for a budget case. NZXT also has a great selection. Their cases look pretty cool as well. NZXT i series comes with their RGB and fan controllers. Corsair is a good choice too. It mostly depends on your budget.

Meshify C

I think you mean a Samsung 970 Evo m.2, in which case that should be fine. You'll get maximum read and write. 1tb is pretty expensive.

You can reuse those unless you need more storage. 
 
you can even just keep them and add the new ones and you'll use all your bays

By no means is this what you need to get but this can be a starting point. Micro ATX systems are cool cause they have a smaller footprint and you sacrifice pretty much nothing. I added white RAM and a white GPU to match the color theme you want. Storage may be overkill but that's up to you, and I added some more premium RGB fans and a fancier cooler as well.
PCPartPicker part list / Price breakdown by merchant Type Item Price CPU Intel - Core i7-8700K 3.7GHz 6-Core Processor £442.80 @ Aria PC CPU Cooler Corsair - H100i PRO 75.0 CFM Liquid CPU Cooler £99.18 @ Amazon UK Motherboard Asus - ROG STRIX Z370-G GAMING (WI-FI AC) Micro ATX LGA1151 Motherboard £188.97 @ Ebuyer Memory Corsair - Vengeance LPX 16GB (2 x 8GB) DDR4-3000 Memory £124.99 @ Aria PC Storage Western Digital - Blue 1TB M.2-2280 Solid State Drive £157.99 @ Amazon UK Storage Seagate - Barracuda 2TB 3.5" 7200RPM Internal Hard Drive £49.94 @ BT Shop Video Card Gigabyte - GeForce GTX 1080 Ti 11GB Gaming OC 11G Video Card £585.46 @ Scan.co.uk Case Fractal Design - Meshify C Mini Dark TG MicroATX Mini Tower Case £82.62 @ CCL Computers Power Supply Corsair - RMx (2018) 650W 80+ Gold Certified Fully-Modular ATX Power Supply £82.98 @ Ebuyer Operating System Microsoft - Windows 10 Home OEM 64-bit £82.97 @ Laptops Direct Case Fan Corsair - HD120 RGB 3-Pack w/Controller 54.4 CFM 120mm Fans £65.99 @ Aria PC   Prices include shipping, taxes, rebates, and discounts     Total £1963.89   Generated by PCPartPicker 2018-10-10 21:03 BST+0100    

PCPartPicker part list / Price breakdown by merchant
CPU: Intel - Core i7-8700K 3.7GHz 6-Core Processor  (£442.80 @ Aria PC) 
CPU Cooler: Corsair - H100i PRO 75.0 CFM Liquid CPU Cooler  (£99.18 @ Amazon UK) 
Motherboard: Asus - ROG STRIX Z370-G GAMING (WI-FI AC) Micro ATX LGA1151 Motherboard  (£188.97 @ Ebuyer) 
Memory: Corsair - Vengeance RGB Pro 16GB (2 x 8GB) DDR4-3200 Memory  (£164.39 @ Aria PC) 
Storage: Samsung - 860 Evo 500GB 2.5" Solid State Drive  (£77.94 @ Aria PC) 
Storage: Seagate - Barracuda 2TB 3.5" 7200RPM Internal Hard Drive  (£49.94 @ BT Shop) 
Video Card: Gigabyte - GeForce GTX 1080 Ti 11GB Gaming OC 11G  Video Card  (£585.46 @ Scan.co.uk) 
Case: NZXT - H500i (White) ATX Mid Tower Case  (£102.63 @ Amazon UK) 
Power Supply: Corsair - RMx (2018) 650W 80+ Gold Certified Fully-Modular ATX Power Supply  (£82.98 @ Ebuyer) 
Operating System: Microsoft - Windows 10 Home OEM 64-bit  (£82.97 @ Laptops Direct) 
Case Fan: Corsair - HD120 RGB 3-Pack w/Controller 54.4 CFM  120mm Fans  (£65.99 @ Aria PC) 
Total: £1943.25
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-10-10 21:20 BST+0100