I'd rather them just completely redo a rather old title, say FFII, but update everything. The graphics, the gameplay, all that stuff. Even tweak the plot so its much more than it was way back then.
As for the other titles...
- The original FF is just kinda screwed. The plot was kinda a "WTF" type of thing and it's just too old really for a remake.
- FFIII, I don't see the appeal. It's kinda forgotten.
- FFIV has a lot of remakes and ports, I'll be satisfied with The Complete Collection on the PSP for now.
- Never saw the appeal in FFV.
- FFVI is pretty awesome but I don't see anything wrong with the original. A remake would just get fanboys pissed for no reason.
- Same goes for FFVII. There's no way to approach it without fanboys crying over it.
- No one cares about FFVIII, what the fuck were they thinking...
- FFIX, it's fine the way it is.