These were prices in August. I did a lot of bargain shopping with coupons and deals, but prices have dropped recently generally (and you can probably get some good deals next month on BF/CM) and you have a lot of headroom. My RAM and HDD were available last week as a Newegg package for less than what I paid for the RAM alone and yesterday my card was on sale for $70 off what I pai
Ryzen 5 2600, 3.4GHz Hexacore - 147
Gigabyte Aorus X470 AM4 Mobo - 119
G.Skill TridentZ 16GB DDR4-3000 - 180
Samsung EVO 860 500GB - 90
EVGA GTX 980Ti - 300 (B-stock refurb; 1 yr warranty)
Thermaltake Suppressor F51 Mid Tower - 60 (after 30 rebate)
EVGA 750W GOLD Modular PSU - 80
Dell S2417DG 24" Monitor 1440p/165Hz/1ms/TN - 330
Still have lots of room in this budget for a liquid system plus a streaming card.
Suggested upgrades: Ryzen 7 2700X Octacore 3.7GHz, EVGA GTX 1080Ti (could be new, but B-stock refurb will get you a good discount). This will let you either do 4k or push max settings at 1440p while maintaining 140+ FPS on even modern games. You might want a 27" monitor instead as well, I prefer 24" personally.
If you're a betting man, you can get some really good deals on AMD GPUs and FreeSync monitors are a lot cheaper than G-Sync monitors. They aren't as powerful as a 1080Ti or the new 2000 line, but the price to performance is really good.