I've done an American wheat with Warrior as my bittering hop, and a little bit of Cascade for flavor. I've tried several variants of this and now prefer to only use First Wort Hops for bittering. I make a single addition of Cascade at 5-mins left. I like to keep it under 20 IBU total. I think your Saaz would make a good late addition instead of Cascade. Just don't overdo it!
Since I am all-grain, I do like to use 50% distilled water when I mash this one, along with some CaCl and CaSO4.. It helps my water chemistry for such a light colored brew..
Good luck!
--LexusChris