Good idea, great list.
(The only surprise is Flower, Sun & Rain. I never played it but it was torn apart by reviewers and even many of the few owners seemed to be disappointed according to comments on amazon pages.)
My list would include lots of games you already mentioned, so instead of repeating half of the titles I add 25 other games which I really liked (or even loved) and weren't mentíoned in the OP:
999: Nine Hours, Nine Persons, Nine Doors
Age of Empires: The Age of Kings
Alice in Wonderland
Anno 1701: Dawn of Discovery
Broken Sword: Shadows of the Templars - The Director's Cut
Castlevania: Dawn of Sorrow
Etrian Odyssey II
Final Fantasy: The 4 Heroes of Light
Final Fantasy Tactics A2: Grimoire of the Rift
Glory of Heracles
Ghost Trick: Phantom Detective
Inazuma Eleven
Infinite Space
Kirby: Canvas Curse
Knights in the Nightmare
Lufia: Curse of the Sinistrals
Lunar Knights
Meteos
Ninjatown
Nostalgia
Puzzle Quest: Challenge of the Warlords
Robocalypse
Sands of Destruction
Summon Night: Twin Age
The Wizard of Oz: Beyond The Yellow Brick Road
The DS has an excellent library.
My next three DS purchases are (hopefully) already on the way:
Okamiden, Solatorobo, Dragon Quest Heroes: Rocket Slime (which was never released in Europe).
