dynamat, while it HAS been proven to be the best, when put into a ratio of cost to quality it loses to a lot of others. personaly I'd double up on either brown bread or B-quiet... it would be cheaper and do slightly more dampening. another new one that i have not gotten my hands on yet is the new E-dead from elemental design...
www.edesignaudio.com err... i think thats the site... brown bread and B-quiet are cheap as hell on ebay... little harder to work with then dynamat.... but maybe the cost is worth it to you....
just trying to get you options.
Torinalth