I think when these comes out, they are worth your points:
Ghostwire: Catch "ghosts" using your camera!
http://gonintendo.com/?p=83672
Dragon Quest Wars: Strategy game for DQ
http://gbatemp.net/index.php?showtopic=155603
Mr. Brain: Square Enix's first DSiware, its supposed to be drama-based..... and "brain-training style"
http://www.siliconera.com/2009/05/14/squar...d-dsiware-game/
I don't own a DSi, but from the looks of it, the Art Style games look pretty good and so does the birds and beans. Warioware has very little micro games from what I've heard so try to stay away from it unless you care about one-time fun.