[Bargain Gamer]

You should buy a shiny new banhammer! XD

Kidding aside, of the three choices you should definitely get the shoes. There's no point in getting a gift you're not going to use (Navi controller) or one you'll only use once (the WiiFit), so buy the one you'll actually use. Failing that, get the new Pokemon White DSi bundle, with a shiny new DS a game and accessories! :D