Actually the PS3 will play all retro games including PS2 and PS1. You can also download PS1 games from the store onto your PS3 and PSP.

Congrats on your decision to ultimately get a PS3, as it won't be long before PS2 is getting lackluster support (No yearly sports game updates, all mini-game or classic game collections, bargain bin games). Update us when you have us so we can add you as a friend.