wih my experience....i self buy,self customised and self assembly and self install(i'm teach IT)....to play games....alot of games i'm prefer AMD CPU with RADEON graphic ....them both most suitable couple...I once had Intel with Nvidia....games...no good but for multimedia purpose(editing video,sound,animation,music) still Intel Rule.......just online games or multiplayer go for AMD(cheaper)....this only my personal thought.............Computer world is a lot larger world than u would expect........buying with big brand for me not fun because of it own design casing...there's only little can be upgrade or modding(warranty out man).............
P.s : I suggest do touch any chinese brand(sorry but its true) or unfamiliar brand of graphic card...or u will regret it later........