I have a PS3 and I never regret it
Even if you're not going to use it only for games it still does a lot to entertain you. I've had mine for over 3 years and while my friends are sending in their (1st-gen) 360s for RRoD, mine is still going strong.
That being said, I am about to buy a 360 as well since most of my friends are on XBL and I love Halo too fucking much (and FM4 looks awesome). I just think it's crap that I have to buy the 250G version to play more than one game. I mean they go from 4G straight to 250G with nothing else in between?? How about an 80G version or something for those who don't need half a computer's worth of memory to play 4 games.