I say get a 360, try it you might like it
Seriously though, Lost Planet, Mass Effect, Gears Of War, Halo 3, Blue Dragon, Lost Oddesey, Virtua Fighter 5, Resident Evil 5, Fable 2, COD3, Forza 2, Dead Rising, Bioshock, Command and Conquer, plus goodness knows what else I cant think of in this sleep deprived state.
I must admit though, there are a few genres the 360 is weak in (fighting being the most annoying for me) but thankfully some Japanese style RPGs are starting to filter on to the console already.
So yeah, GET one. That dont mean that you shouldnt buy a PS3, but its just losing a lot of exclusives to the 360... GTA4, VF5 plus a few others. There are rumors of MGS4, but dont count on that yet till there is more solid info.
Xbox live is better then the PS3's offerings too, the only downside is you have to pay to play.
It should be noted, I am a 360 fan (not a fanboy) but a person who really enjoys the console. I will however buy a PS3, and maybe a wii too.