It's my Birthday today and I have a tough question

Okay, for my gifts I got Brawl (got it when it came out, but it counts as a present), clothes, comics, and some other stuff. I also got a "certificate" for one game. I'm thinking of getting Mario Kart Wii, but I heard that Nintendo might make a new DS and show it at E3. So should I just buy MKWii, or should I wait to see if Nintendo releases a new DS. By the way I don't have a DS or a DS Lite. I also don't want Nintendo to release a new handheld shortly after their new redesign (if they do have a redesign) because then I might be left in the dust with a micro 2.