Hmmm, maybe I'll give it a shot. I'm always down for a good racing game.
I planned on getting the Game Boy Advance SP, but I played it in the store and don't like the feel of it. the weight is far from your hands supporting it, so it makes the "controller" part want to flip up and away from you (picture holding a ruler vertically with a weight on the end far away from you), and they made the dumb move of making it "tall" and not "wide", so my arms/hands are too close together. Add in the fact that your fingers have to go on the shoulder buttons instead of supporting the GBA, and you have an awkward machine.