PCPartPicker part list / Price breakdown by merchant
I'd get a 1080Ti or a vega 64 for 4K
The 56 is good, but it's on the lower end side of high settings 4K gaming.
20- series are good too, keep forgetting bout them.
Most of the games I play are slightly older/less demanding, and I can't fit a vega 64 into my budget
ok, I'd just keep that in mind though.