In addition to Adolph's list, I highly recommend Dark Void Zero and Art Style: Digidrive. Also, Soul of Darkness, an old-school Castlevania clone that's apparently transferrable despite most of Gameloft's other titles not being so, and Chronos Twin, which is a really tough action platformer that makes interesting use of the dual screen functionality.
EDIT: I just checked, and I have 1300 points left on my DSi. Assuming they won't transfer over, I need to spend them before Monday. Preferably I'd go with an 800 and a 500, but I don't see any 800s that I'm interested in and don't already have. There are a couple 1000s I want, but then I'd be leaving 100 on the table, and that's assuming I find a 200 that I care about. Any suggestions?