My personal favorite is Paulaner. Erdinger is also good, but in general any German hefeweizen way surpasses any American wheat. The closest I've found is Widmer. And as far as I know there are no US examples of Dunkel Weizen, the dark German wheat beer.
I dislike hefewizen in general, I'm just a dark beer kind of guy, but OH MY GOD Erdinger Dunkel Weizen is amazing, and it's become fairly easy to find in the US.
