You guys forgot about the most important one. Gran Turismo.
Plus I just recently got a PSP with GTPSP so cars and funds (hopefully) will transfer over when GT5 comes out, and one thing I love about it is I can stream movies from my ps3 from anywere on the planet. You have to leave the ps3 on but if you were in a Wifi area you can log on to your ps3 and watch movies. This is a really cool feature that I love.
Another good reason is HDD upgrades. I just put a 640 gb hardrive in mine so I have plenty of room for a long time. I have 20 demos on mine plus 30 movies.
And maybe for a good story you could check out Heavy Rain this games looks pretty good.