I would like to build a 15" subwoofer for my home theater system and I've seen a lot of recommendations on this board regarding the Dayton Quatro driver. At more than double the price, what advantages does the Titanic MKIII offer over its less expensive sibling? I have a very large and open room that I'll be using the sub in, and my usage ratio is about 50% HDTV/DVD, 30% xbox, 20% music. Which sub do the experts recommend?