I'd say go for the Wii for the same reasons as bbsin
You have a kid who would enjoy the mario universe very much and this year many core title will be coming, not to mention MotionPlus!
I'd say the Wii is actually the console with the most potential - sorry PS3 follwers but I think that with pretty much a completely new controller half way through the Wii's life mixed with the fact third parties have shifted their resources to the Wii this year in a big way (and will continue to for years to come) I think that Wii has the most potential and is most future proof







