I personaly like the few 3-D's on ds but...

1. Mario party ds
2. Super mario 64 ds
3. Final fantasy 3, one of the most awesome games i have
4. COD4 and COD5 are very good
5. Metroid prime hunters is a 3-D shooter and was awesome!!
6. Clubhouse games is pretty good, i think its 52 card and board games
7. Worms open warfare 1 and 2 are brilliant
8. Scribblenauts its good

you might wanna check some of these out first if your insure.
hope it helped.