I've done half a dozen or so:
Scottish Ale, Imperial Blonde, Pumpkin Spice Porter, India Black Ale, Oatmeal Stout, Weizenbier
I'd have to say my favorite by far is the India Black Ale. My kit came with Millennium and Zythos hops, and Danstar Bry-97 dry yeast. Delicious roasty, coffee, dark...