UnitedMonkey

So plug them in it just I can’t change the speeds manually basically?? 

i would agree. the 8600k is a very impressive chip. You can pretty easily overclock to the 5.0GHz range, and performs just as good in gaming as the 7700k in most cases with better temps and at a cheaper price. 

It'll give you more room in the future. If you want to get CFL, the i5 is a good choice as well when compared to the 7700K as it runs cooler and hits 5.0GHz on air. 

This is a uniquely US event. The day after US Thanksgiving is Black Friday, retail outlets open very early and offer incredibly good sales on a few items. Riots, literally, ensue. To counter this, US etailers offer very good deals on the Monday following US Thanksgiving, (so people could shop at work ).

Get the cheaper Strix Z370-F mobo. Its pretty much the same mobo. Don't pay that much for your OS, its a waste of money. Dont get a WD Black, makes no sense and is ridiculously over priced. Id get this AIO instead if youre set on getting an AIO, as opposed to an air cooler;
https://au.pcpartpicker.com/product/RcdFf7/cooler-master-masterliquid-ml240l-rgb-667-cfm-liquid-cpu-cooler-mlw-d24m-a20pc-r1#viewImages

you definitely go for 1440p monitor with that budget haha. alright lets see if you wanted to include a monitor & get the performance build, then consider something like this. 
PCPartPicker part list / Price breakdown by merchant
CPU: Intel - Core i7-8700K 3.7GHz 6-Core Processor  ($549.00 @ Umart) 
CPU Cooler: Corsair - H100i v2 70.7 CFM Liquid CPU Cooler  ($139.00 @ PLE Computers) 
Motherboard: Gigabyte - Z370 AORUS Ultra Gaming (rev. 1.0) ATX LGA1151 Motherboard  ($265.00 @ Shopping Express) 
Memory: G.Skill - Trident Z 16GB (2 x 8GB) DDR4-3200 Memory  ($235.00 @ Scorptec) 
Storage: Crucial - MX300 525GB 2.5" Solid State Drive  ($197.00 @ Shopping Express) 
Storage: Western Digital - Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive  ($60.00 @ Shopping Express) 
Video Card: EVGA - GeForce GTX 1080 Ti 11GB SC2 Video Card  ($1099.00 @ Umart) 
Case: Phanteks - ECLIPSE P400S TEMPERED GLASS ATX Mid Tower Case  ($129.00 @ PCCaseGear) 
Power Supply: SeaSonic - FOCUS Plus Gold 650W 80+ Gold Certified Fully-Modular ATX Power Supply  ($148.50 @ Newegg Australia) 
Monitor: Asus - MG279Q 27.0" 2560x1440 144Hz Monitor  ($759.00 @ Shopping Express) 
Total: $3580.50
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-10-20 18:22 AEDT+1100
 

PCPartPicker part list / Price breakdown by merchant
CPU: Intel - Core i7-8700K 3.7GHz 6-Core Processor  ($549.00 @ Umart) 
CPU Cooler: be quiet! - Dark Rock Pro 3 67.8 CFM Fluid Dynamic Bearing CPU Cooler  ($109.00 @ PCCaseGear) 
Motherboard: Asus - ROG STRIX Z370-F GAMING ATX LGA1151 Motherboard  ($293.00 @ Shopping Express) 
Memory: Corsair - Vengeance LPX 16GB (2 x 8GB) DDR4-3000 Memory  ($229.00 @ Shopping Express) 
Storage: Samsung - 850 EVO-Series 500GB 2.5" Solid State Drive  ($213.00 @ IJK) 
Storage: Seagate - Barracuda 2TB 3.5" 7200RPM Internal Hard Drive  ($87.00 @ Shopping Express) 
Video Card: EVGA - GeForce GTX 1080 Ti 11GB SC Black Edition Video Card  ($1079.00 @ Umart) 
Case: Cooler Master - MasterCase H500P ATX Mid Tower Case  ($189.00 @ PLE Computers) 
Power Supply: EVGA - SuperNOVA G2 750W 80+ Gold Certified Fully-Modular ATX Power Supply  ($149.00 @ IJK) 
Monitor: AOC - AGON AG322QCX 31.5" 2560x1440 144Hz Monitor  ($478.00 @ Shopping Express) 
Total: $3375.00

& this is aesthetic build excluded monitor. you can check the asus mg279Q i included earlier, thats a good one. But for more monitor suggestion, @Sanctorum can help you out.  
 
PCPartPicker part list / Price breakdown by merchant
CPU: Intel - Core i7-8700K 3.7GHz 6-Core Processor  ($549.00 @ Umart) 
CPU Cooler: NZXT - Kraken X62 Rev 2 98.2 CFM Liquid CPU Cooler  ($239.00 @ PCCaseGear) 
Motherboard: Asus - ROG STRIX Z370-F GAMING ATX LGA1151 Motherboard  ($293.00 @ Shopping Express) 
Memory: G.Skill - Trident Z RGB 16GB (2 x 8GB) DDR4-3200 Memory  ($275.00 @ IJK) 
Storage: Samsung - 850 EVO-Series 500GB 2.5" Solid State Drive  ($213.00 @ IJK) 
Storage: Western Digital - BLACK SERIES 2TB 3.5" 7200RPM Internal Hard Drive  ($165.00 @ Shopping Express) 
Video Card: Asus - GeForce GTX 1080 Ti 11GB STRIX GAMING Video Card  ($1149.00 @ Shopping Express) 
Case: Phanteks - ECLIPSE P400S TEMPERED GLASS ATX Mid Tower Case  ($129.00 @ PCCaseGear) 
Power Supply: SeaSonic - FOCUS Plus Gold 650W 80+ Gold Certified Fully-Modular ATX Power Supply  ($148.50 @ Newegg Australia) 
Total: $3160.50
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-10-20 18:34 AEDT+1100

While they are tough to get at the moment, an i7-8700K really is the best choice. It is worth waiting if you can.
 
Since you are using an Asus Aura Sync motherboard (good choice BTW), use Aura Sync compatible components.
 
There is room in the budget for a 1TB ssd. If you really do need more storage, a Barracuda or WD Blue hdd can be easily added.
 
Case is a personal choice. If you love the Air 740, that's fine. But if you are open to something else, you might take a look at some of the Phanteks cases with Aura Sync compatible lighting and tempered glass windows.
 
A 550W psu is enough, 650W is more than enough.
 
au.pcpartpicker.com is a great tool for assembling builds. If you find different pricing or need a part that isn't listed, custom pricing and parts are easily included.
 
PCPartPicker part list / Price breakdown by merchant
CPU: Intel - Core i7-8700K 3.7GHz 6-Core Processor  ($549.00 @ Umart) 
CPU Cooler: Deepcool - CAPTAIN 240EX RGB 153.0 CFM Liquid CPU Cooler  ($149.00 @ PCCaseGear) 
Motherboard: Asus - ROG STRIX Z370-F GAMING ATX LGA1151 Motherboard  ($293.00 @ Shopping Express) 
Memory: G.Skill - Trident Z RGB 16GB (2 x 8GB) DDR4-3000 Memory  ($265.00 @ Mwave Australia) 
Storage: Samsung - 850 EVO-Series 1TB 2.5" Solid State Drive  ($399.00 @ Shopping Express) 
Video Card: Asus - GeForce GTX 1080 8GB ROG STRIX Video Card  ($889.00 @ Shopping Express) 
Case: Corsair - Air 740 ATX Full Tower Case  ($189.00 @ Shopping Express) 
Power Supply: SeaSonic - FOCUS Plus Gold 650W 80+ Gold Certified Fully-Modular ATX Power Supply  ($148.50 @ Newegg Australia) 
Total: $2881.50
Generated by PCPartPicker 2017-10-20 17:33 AEDT+1100

so i have a 7700k and a 1080 TI and at max on 1440p im still only getting like 75 fps average with dips into mid 60s. my point is, if your spending that much on a build, a 1080 TI should definently wiggle its way in there somewhere. the monitors are a big deal though, because if i was running 1080p that would shoot up to near a 100 fps average. less resolution, less needed horsepower if that makes sense. so really we need to know those monitors.

Get a Coffee Lake processor. You should be able to get a i7-8700K + GTX 1080Ti PC for less than $3000 AUD.

kaby lake isn't good value with coffee lake out now. even if availability isn't quite there.
 
and you don't really need that much wattage on PSU good model tho