I have an Intel i7 3770w (3.5 Ghz) running on a AsRock Fatal1ty Professional MB, with 16 gigs of memory on an older nVidia GTS 250 video card. Every game you listed a few posts ago runs 100%
Mb was $179, CPU $279 and memory was $100 (Corsair). System kicks arse!!! Amazing how quick roms and CHDs load. Almost instantly. Every game seems to load as fast as Pac-Man or Donkey Kong. LOVE IT!!