@Tech101 Your list is pretty much the same as mine except minus FFX (I missed out on the PS2). I might go with Kain, Terra, Aeris and Vivi.
@BluTyGer I'd give it a shot if you're a rhythm fan. Maybe watch some more footage or try the demo if you can.
I have many friends who love FF music but have never played the games before. There's bound to be many tracks that you will like.
It's got everything you want in a rhythm game: some of the best RPG music (over 70 tracks in the cart + DLC), 3 levels of difficulty, multiple modes including a practice mode and heaps of unlockables. I read somewhere that there's local multiplayer as well. There are some light RPG elements like levelling up and attacks/magic which might change things up a bit.
The only downer for me was the visuals. They're not as varied as say Rhythm Heaven except the 'event' tracks which show FMVs from the games. On the otherhand they're not distracting.
!! but then when i started playing somehow i got into the game playing 3 hours straight in the demo trying to do the expert level 
