Blu-Ray all the way!
Call me crazy, but I like to have something tangible when I pay money for a game. Not just data on my HDD.
I do not allow my GF to touch disks (so that I have everithing in its place), console (so that I am sure she won't scratch that removing dust) and G25 (though she bought one for my last birthday).my girlfriend kept taking it out and putting Ratchet and Clank in there.
I bought the PS3 starterpack which includes GT5