I remember wanting to try out Samba de Amigo so much as a kid after seeing some kids playing it in a store. I thought it looked like great fun. Unfortunately I never got to play it, who the hell wanted to shell out extra money for a whole new controller for just one game? Plus I didn't have a Dreamcast, so yeah, that hurts.
Star Control 2 is a game that I've never played. I'm sure I probably should have considering it's similarities to many other PC titles that I seriously enjoy, but I've just never gotten around to playing it. Looks like great fun though.
I went with Star Control 2 in the end. A music game (unless it's PaRappa the Rapper) shouldn't advance in my opinion.