I went thru the same thing on a driving cab. I finally decided after much research I went with a driving tube frame, from playseats.com, with a logitech G25. Quad core setup with 8800GT video, Z5500 speakers & a 32" lcd. I know I have said this before but I just replaced the speakers & i will post pictures this weekend after I finish the wiring this week, I have been playing "dirt" that is a awesome racing game.
dm