What are some games worth a purchase?

I just got a DS and all I have are NSMB and Mario Kart DS and Brain Age

There are all real great games but I have beaten my Mario games and Brain age is not really a game

I was wondering what else I should get, besides pokemon and anything that isnt out on shelves.

PS is Megaman out or what? Theres no rating yet it is said to have been released. Also how is starfox and metroid?

Custom Robo. I wrote a review on it so I won't bother repeating myself.

Age of Empires DS. I've spent more time in that game than a Fire Emblem game and if you know me, then that is a lot. (300 hours +)

Final Fantasy III. Amazing RPG. Well worthwhatver price you come across.

You already said Mario Kart and Pokemon so there's my list...