A guy on Craigslist has a Gravity fat bike with a Rockshox Bluto 120mm fork and Sram x7 x 2 drive train. The price is $799 and the pictures look like the bike is in very good condition. Also 45 north Husker Du tires were added and appear in good condition. The bike seems like a good deal. My question is, is it worth investing in a bike like this or holding out for a Surly Pugsley or Salsa Mukluk?