After setting up my Superfly and my MacCat Deluxe this morning, I'm going to have to say the Superfly would be a superior tarp if your only going to have 1. It covers all needs and possibilities without sacrificing much weight gain. Your looking at about a total of 7 extra ounces over an Ultra. Unless you get a Spinntex Ultra, and then well you'd be my hero.
Not the guy to ask for Directions.