Quest for games

Excited by my new DS purchase I went out in search of a new game for my cherished bit of hardware. I had a bit of a check of the reviews and narrowed down a list of potentials:-
Super Mario DS
Wario Ware Touched
Yoshi Touch & GO!
Considering the limited number of DS titles out at the moment I kept my eye out for a couple of gba titles like Astroboy: Omega factor or Metal Slug Advanced as well.
The gameboy advanced titles work really well an the DS. The colours are bright and vibrant with a greater sense of detail than the gba SP.
The only trouble is finding a game for less than $70!