4000 Wii points

I just got 2 wii points cards... What should I buy? And I know its off topic, should I buy anything on DSi?

if you are a fan of the zelda series, you might want to check out neutopia 1 and 2.

other choices - super mario rpg, majoras mask, OoT if you dont have them

You should check out the Games Recommendation Thread :). It's very helpful and hopefully it will help you with your decision.