Well going by your PS2 games list, I would get a PS3. FF, GoW, J&D, R&C etc will all be appearing on the PS3. Also if you got the 80GB, you could play all those PS2 games.
Going by your avatar, I would wait until reviews of Banjo 3 come in. If it turns out to be awesome you might want to pick up a 360 :).
Hope I helped :D