@ S.T.A.G.E
You only have 1 game that requires a hefty installation though, and yes, some multiplat does require a large amount of space, mostly capcom is to blame, but on pure installation, you have to have an equivilant of 14 games the size of resident evil 5 to fill up yout HDD. And judging by your game colletion even on the 360 (which is also mostly exclusives) you'll take a grand time of doing that, the more liekly scenario is a few games, some video clip, a couple of demos and a few PSN games. But then you're PS3 is suddenly doing stuff that previous generation weren't capable off and its once again the simplicity versus functionality debate.
That said 500gb is the way to go, I've had one since I bought my PS3 and never looked back :)













