A surly cross check could make a nice ssfg touring bike as it allows for fenders, and front (2011 at least) and rear racks, though you might not want to load it down that much if touring fixed. With my touring bike still in transit I have thought about taking off for a camping trip on my fixed gear, but it just doesn't sound that fun to me since I like to be able to take it slow and not work as hard as I would have to if touring fixed.