PCPartPicker part list / Price breakdown by merchant
Type
Item
Price
CPU
AMD - Ryzen 7 2700X 3.7 GHz 8-Core Processor
$329.89 @ OutletPC
CPU Cooler
be quiet! - Dark Rock Pro 4 50.5 CFM CPU Cooler
$82.89 @ OutletPC
Motherboard
Asus - Prime X470-Pro ATX AM4 Motherboard
$179.79 @ OutletPC
Memory
G.Skill - Ripjaws V Series 32 GB (2 x 16 GB) DDR4-3200 Memory
$254.99 @ Newegg
Storage
Samsung - 970 Evo 500 GB M.2-2280 Solid State Drive
$117.99 @ B&H
Storage
Seagate - Barracuda 2 TB 3.5" 7200RPM Internal Hard Drive
$58.89 @ OutletPC
Video Card
EVGA - GeForce RTX 2080 8 GB Black Video Card
$699.99 @ SuperBiiz
Case
Fractal Design - Meshify C White TG ATX Mid Tower Case
$99.98 @ Newegg
Power Supply
Corsair - RMx (2018) 550 W 80+ Gold Certified Fully-Modular ATX Power Supply
$59.99 @ Newegg
Prices include shipping, taxes, rebates, and discounts
Total (before mail-in rebates)
$1924.40
Mail-in rebates
-$40.00
Total
$1884.40
Generated by PCPartPicker 2018-12-09 20:12 EST-0500
You could go with a 9900k, but I still think the price for it is outrageous.
The AM4 socket for the cpu won't be dying off any time soon, so upgradability is totally viable if you would need to in short run.
1080ti is a fine choice, but unless you buy used you'll be paying a low supply/high demand price.