I would get Super Metroid, because I'm lame and I've never played it. I would also get some old favorite NES games like bubble bobble and kirby's adventure.
I LOVED Bubble Bobble! That would probably be my pick. Although Zelda/Mario 64 both hold nastalgia as well as I grew up with the NES and N64, so it would be a toss up b/w those three I think! : ) Oh the choices...!