Uh, whichevers cheapest. People seem to hate AMD-anything. I have a full £350 AMD rig and I can run everything I want at like 30-60 fps on high so uh, yeah. You don't need a fancy 980TIXTREMEEDITION2017prerelease12gb video card to run a game well. If you're tight for cash and on a budget build, I really REALLY recommend a second hand R280X or a 960 2GB version, I picked up some old model 280x for £20 in a hardware spare parts area so just look around there for cheap deals and such. as for processors - everyone's gona tell you to get an I5 or I7 - if you're like me and have no money, buy an AMD FX4300 first or second hand for about £30 and you're set for pretty much anything.
Kinda rambled on but, yeah! Hope this helped I guess.
None of this really matters though, you could have two titans strapped together with an octa-core processor and you'd still never get above 30fps on clockwork.