Some games I haven't seen mentioned, (some soon to be released)
For the DS:
Blue Dragon Plus (if you liked Blue Dragon)
Luminous Arc 2(someone mentioned the first)
Valkyrie Profile: Covenant of the Plume (Releases next month)
Avalon Code (releases next month... The experienced Nintendo DS development team behind the Final Fantasy III and Final Fantasy IV remakes, Matrix Software, is at the helm together with the creative minds behind the Harvest Moon and Rune Factory series)
Final Fantasy Crystal Chronicles: Echoes of Time (next month as well)

I say wait for the DSi that releases in April if you plan to get a DS.

That is pretty much my life for the next few months. Plus Madworld for the Wii.

THE JACKEL