I've done a few all grain versions of this American Wheat, which my is not my favorite style, but my wife really likes it (along w/ hefes and wits). I do all grain versions of this, so this is a stab at an extract version:
6.5 lbs Liquid Wheat Extract
8oz Munich Malt
4 oz Crystal 10
1 oz Tettnang @ 60min
1 oz Cascade 10 min
1 oz Cascade 5 min
Safale US-05/ Wyeast 1056/ WLP 001
My AG recipe changes all the time, but this would be one of the versions I've done. I mostly change the hops and try different combos, but to match my wife's requests I keep the IBU's low and try to give it a citrus aroma and flavor to it. I've also used Kolsch yeast (Wyeast 2565) once and it came out great, but then I guess it wouldn't be an "American" wheat. Also, you may want to add half the extract in the beginning of the boil and the rest with about 20-15 minutes left in the boil to keep the color lower...unless you are going for a darker color.
Good luck and let us know how it goes!