Playstation 3

So I've been thinking about this a lot lately. I'm gonna get a PS3. Rock Band is so amazing but I need more songs!!! Err go, the PS3 version, which allows you to download new songs. The peripherals are the same for the PS2 and PS3 so I'll just need to buy the game and get another guitar. My issue now is being able to purchase one when the time comes. I feel I still need backwards compatibility so I'm not getting the 40GB model and the 80GB isn't being distributed right now (and possibly gone completely). I don't even care much for all that hard drive space. I'm selling my old laptop and when the time comes I'll sell my PS2 as well so that's my funding for purchasing it. Anybody wanna buy an old laptop with XP Pro in excellent condition? Any thoughts?