Can you not just buy a Blu-ray player? It'd be silly swapping a 360 for a PS3 just for that reason especially as overall the XBOX has the better games and is better online. I've owned all kinds of consoles growing up including playstations and for me the 360 is the best at gaming yet. I really doubt you'll find the gaming better on PS3.

On this particular site more people seem to own the PS3 so you'll get swayed that way asking here.