Id get a 360. All games consoles since the dawn of time have been crap as movie players compared to stand alone. If your that bothered about bluray buy a bluray player. It will be better the PS3 anyway. I seem to recall the PS3 not being compatible with bluray 1.1 content anyway unless thats been fixed.
Hardware wise the PS3 isnt as powerful as the 360 when its in used, it reserves a sh*tload of memory and a whole portion of the cell for the dashboard.
When that strikes, the 360 eclipses it. All games look better on the 360, bar DiRT.
Theres only one reason to buy a PS3. Thats if your a brand whore and have to have it because it says "SONY".
Can put it with your Civic, kerb chains and bangrha sounds.
If its just GHII, then get a PS2. Or future proof yourself and get a 360.
If you want to experience the love of a 360, playing Halo3 on a 70" RPTV give me a shout.