I live in North America so 5 is not out on the PSN network.
I do not own a Wii.

So my choices left are SNES, PS1, or GBA.

Are all the versions direct ports from the SNES version with no graphical updates or changes?

SNES and PS1 versions are the same, I think the only diference is that there's an FMV at the begining of the game in the PS1 version.

The GBA version I think has 4 more jobs, some slight diferences such as monster locations, and a few translation and name changes (some areas, characters, spells, items and enemies have diferent names in this version)

This post was edited by zarkadon on Jun 24 2011 05:05am

I'll also add in that there is a long bonus dungeon (after you beat the game) where the bosses are extremely difficult.. new weapons in that dungeon as well as armor and enemies. Also once you beat the bonus dungeon you are able to go through this trial where you can fight about 20-28 bosses. (I don't remember the exact amount)

This is only for the GBA FF5 btw.

This post was edited by xOmegA on Jun 24 2011 02:07pm

This sounds like the win version.

Every system has some new feature to it, suppose I think, at the end of V there's a extra boss or something.