Agreed with Xenogears and Chrono Cross. Chrono Cross has the same major problem as Xenogears - far too much important plot is revealed through exposition at the end of the game rather than being revealed naturally through gameplay.

Also agreed with Secret of Mana being re-released with restorations of all the sections that were originally cut out.

Other than that I can't think of anything that desperately needs a remake but Square Enix really need to release Seiken Densetsu 3 outside of Japan.