In my opinion, right now, if you want to buy a console buy a 360.
In 6 months? Buy a ps3.
Simply put, the 360 wins currently only due to the games, nothing more. Currently the 360 has far superior games but the ps3 is in itself, a better console.
So in summary, if you're looking to buy right now get a 360. If you're looking to buy in 3-6 months get a ps3.
Personally I have both 360 and ps3. Wii isn't even a contender for the serious gamer.
Currently my 360 is out of action due to an accident, but im bringing it back to life at the weekend