O.k. so i've done my research, bought some books, readup lurked in teh forums and come to the decision that i want a digitrax super empire builder dcc system (or super chief if i can get one used). But i was poking around somewhere and i came accross a listing for the MTH DCS system. What is DCS, and why is it "better" than dcc? The gear looks about the same price range as the digitrax stuff. Is this a vendor's attempt at making dcc proprietary?