Noble hops are classic for wheat ales but American hops are good choices also. I would try centennial/citra/columbus for my wheat, but that's just me! ;-)
I've made the Lemon-Lime Hef in the recipe section a couple times now. It calls for Motueka as supposedly its very citrusy. My LHBS didn't have it but I substituted Sterling for it and it turned out pretty good.
Strawberries add a citric acid tartness so keep the bitterness on the low side to avoid a bitter/tart thing going on. I personally use magnum for all my bittering additions. Belma hops have a strawberry kind of thing going on if you don't like the idea of using magnum.