If you were to go out and buy a G4, I'd switch to MOTU digital performer over logic. It completely slaughters logic in terms of capabilties, and it's far more intuitive. I used to use a PC for music. Switching to a mac was the best move I ever made. You should consider it. I used to make fun of mac users until I became one. Now I understand, and so shall you my son if you switch.