GamespotApparently, FF1&2 for the GBA in Japan has a postcard in it from SquareEnix, asking them what game they'd like to see Square make on the Nintendo DS.
Final Fantasy III (that's the Japanese-numbered FF3, the one from the NES, never seen in America).
Final Fantasy IV, V, and VI (all three SNES games).
Seiken Densetsu (the prequel to Secret of Mana, released in America on the GameBoy as FF Adventure, and remade on the GBA as Sword of Mana, but may be referring to the "series", which included two SNES titles).
The SaGa series.
Front Mission.
Chrono Trigger.
Hanjuku Hero (I must admit that I don't know this title).
Or the "Chocobo" series (which I believe would mean "Chocobo's Mysterious Dungeon", a random-dungeon generating game series on the PSX, IIRC).