That price is really too high. For stainless pipes and mufflers I would expect to pay <$600. I bet you could pick up the pipes and mufflers and get a shop to bend it up and install for way less than $1100. As a point of reference, I have a full stainless system on my car from GM Performance Parts. It includes resonator, two mufflers, all pipes, all band clamps and nice tips, mostly 2.5". That thing used to sell for like $550 at the dealer counter.
EDIT: one other point - I love the idea of stainless exhaust, but a lot of us are changing stuff on our rigs too often to commit to an exhaust that will last 20 years. Plus, it seems we all end up wanting/needing the exhaust a little different based on headers, doublers, suspension mods, etc. to go with a "kit".