Well it does depend on if Gennos has a PSP/Vita or can emulate them. If he does, get that version like Christ I am completely fucking asleep but yeah do what OrochiGill said and get the PSP version.
Besides, Rydia's in all versions so who cares
But I'd say get the GBA version of FF5 and 6 at least since they're both good stuff.
There was a sig here. Its gone now (thanks photobucket ya fecks)