Animal Crossing: Wild World
Castlevania: Dawn of Sorrow
Sonic Rush
Burnout Legends
Sonic Adventure 2 (Less then $20 at Walmart.com)
Final Fantasy IV Advance
...
Animal Crossing: Wild World... unless you liked the original, stay away from this. Personally, I find Animal Crossing to be sooo boring but well, it's your choice...
Castlevania: Dawn of Sorrow... people whine that this is short... maybe it is... but only if you look at the final game clock ; you'll spend a lot of time dying and getting trashed by bosses so your playtime should reach 10-15 hours while your real playtime will be about 20-25 hours or even more if you want to see everything (and you should!). Also, hard mode isn't just a gimmick in this game (it isn't just the damage that changes!) and there is the classic boss rush mode as well as a new mode with extra characters which, unlike in past Castlevania games, isn't actually an afterthought! Also, you get to create your own custom mini-dungeon and to use it in multiplayer games. All in all, this is the one you should get, in my opinion.
Sonic Rush... horribly overated. Yet another Sonic Advance 2 style Sonic game... read: push right and never do anything else or almost. Stay away from this game or better yet, get a genesis and the genesis Sonic games. Sigh... why don't Sega understand that what is important is NOT excessive speed but level design?
Burnout Legends... can't comment much on that, unfortunately... but usually, Burnout come off as inferior to F-Zero in terms of racing, inferior to Mario Kart in terms of item blasting.
Sonic Adventure 2... since you get it for 20 $, it's not too bad... but otherwise, Sonic isn't what it used to be, although the 3D games tend to have better gameplay surprisingly than the new 2D games (COUGH! Sonic Rush COUGH!). Not the best choice, definitely.
Final Fantasy IV Advance... very good yet overated RPG. Get this if you never experienced the SNES version... else, this is deja-vu and I would wait for FF3 DS, which unlike FF4, is a game you probably never played (unless you're into emulators and fan translations)... and even then, FF3 is given a MAJOR overhaul while FF4 only get FF1&2 Dawn of Souls-style GFX upgrades.
Well, all in all, I recommend Castlevania Dawn of Sorrow. If you don't have them already, I suggest getting also:
Gamecube:
Metroid Prime
Metroid Prime 2
Super Smash Brothers Melee
Resident Evil 4
Soul Calibur 2
F-Zero GX
Mario Kart Double Dash
Super Mario Sunshine (horribly underated)
Nintendo DS:
Meteos
Kirby Canvas Curse
Wario Wares
Gameboy Advance:
Castlevania Aria of Sorrow
Wario Wares
Metroid Zero Mission
Good games, good...
Well, that's all. Have a nice day.