Get a 760 gtx with a Haswell I5, 8 gig of DDR ram minimum, decent power supply, and a SSD HD, and be set for a couple of years with 1080P gaming
This is EXACTLY what I just bought. My computer boots up in like 5 seconds, and the few games I played get good fps with maxed out settings.
Video: Optoma HD3300, Panamorph UH480, Darbee Darblet, Samsung BD D6700 Blu Ray player, DIY Seymour Centerstage XD 138" Curved Screen
LCR - Tannoy DC12i, Sides - Tannoy IW63, Rears - Tannoy Saturn DC6ti Bookshelf, Ceilings - Tannoy CMS 603DC (TF), Tannoy CMS 601DC (TR), 3 Micro Marty/1 Full Marty DIY subs
Amplification: Emotiva XPA-3, Emotiva XPA-2, Outlaw Audio 7700, 2x Inuke 6000DSP
Receiver: Anthem MRX 720