welcome

anyways you can play most of the games on the ps2 if you want to go with something cheaper. but seeing as when FFXIII comes out itd more then likly be on PS3 you might want to get one of those but FFXIII might not come out for sometime. as in more then a year.

as for playing all the FF's they are not all directly connected so you can jump from FFI to FFIX if you wanted and not be lost. as for crises core play FFVII first would probably be a good idea. and btw theres a lot of ff's so if you plan on playing them all be prepared to spend a 1000 hours worth of video gameing. especially if you want to find the secrets and beat the strongest enemies in the game.