I've completed Final Fantasy I-VII. I never did finish VIII (I got onto the second disc), nor did I ever finish IX (Second disc again), or X. I used to play XI, and would play more of it if there weren't a monthly fee involved. I tried to play XII last year, and while it was quite different, I DID enjoy it. Though, now we're getting out of retro gaming territory.
I've beaten Chrono Trigger tons of times. I could never get into Chrono Cross, but I'm gonna try again after I graduate, I think.
My love of retro gaming isn't limited to RPGs though. I've beaten all of the 2D Metroid games, and have played more than my fair share of Castlevania. Sonic, Mario (remember Super Mario RPG?), Donkey Kong, this stuff was my childhood! I'll be a gamer for life (and, if I get my way, I'll be composing music for games after college!)