Congrats! It's got too many great games, really. :p
I personally really like Zelda PH, Hotel Dusk, the Phoenix Wright games, Tingle RPG, FF IV, TWEWY, Viewtiful Joe DT, Advance Wars (especially Days of Ruin), Kirby Canvas Curse, Mario Kart, New SMB, Rune Factory, the Castlevania games, Animal Crossing, Chrono Trigger, Mario & Luigi, N+ (really, get this), Professor Layton, Yoshi's Island, Wario Ware Touched, Trauma Center 1&2, Picross, Fire Emblem, Contact and... Bust a Move. Well yeah I'm just a sucker for Bust a Move.
... God I have too many DS games. :p
Nintendo Network ID: Cheebee 3DS Code: 2320 - 6113 - 9046