http://smbdx.sega-europe.com/
It's finally here! A Super Monkey Ball game for the addicts such as myself! 114 levels from the first game, 140 from the second; and 40 made for this game! Plus a quasi-lesson mode is included (start at beginner, game moves you up to intermediate, etc.)
Story mode won't be great, never is with these type of games, but think of the multiplayer possibilities! 12 minigames, and only 30$.
This one is definitely a must-buy for me.