I have a 360, and it is really nice for gaming, and I always see more games for better prices for it than the PS3. IMO the PS3 is much more solidly built, and of course more versatile. AND it has Gran Turismo, and the older force feedback Logitech Force Pro wheel works on both the PS2, PS3 and PC, which rocks (although I have the Logitech Momo wheel for PC too). I really wouldn't mind having a PS3 as well.
The old Xbox 360 was very noisy! I had the first one replaced due to RROD, and the new one is better, but still quite loud. The PS3 slim that I heard was quieter, but that could have been where it was standing.