Oh hell yeah, a special-edition of either handheld would be great. And the idea of enhanced ports seems to be something SE is more than accustomed to at this point: all of the SNES Final Fantasy games were enhanced and ported onto the GBA, Final Fantasy Tactics had a great port on to the PSP, and now CT is having a phenomenal enhanced port, and to make things better, they don't just stop at fixing up the script, they tend to add some bonus material. Looks like un-enhanced ports are nonexistent now: it's either an enhanced port or an enhanced remake (like Final Fantasy 3 and 4 on the DS).
But hardware-wise, Chrono Cross is already at the DS and PSP's level, so there's no reason to remake the game; a simple port will do good. The real question (for me, at least) is whether I'd rather see it on the PSP or the DS.