Out of the bunch listed, Xenogears would do well to get a proper remake, but without the original developers, I'm not sure about the quality. My next choice would be either Live A Live or the Romancing SaGa series as they were both denied to the West, so having the chance to play them without emulation would be pretty cool.

I really wish SE would just take the plunge and just release anthology style games of SaGa, Mana, and Front Mission. I don't need a graphical overhaul or remake, just translate the originals and mash them together in a set.