I went with RAAMat for mine, and wound up ordering 2 of their 37.5 sq ft kits (20 sheets ea with the accompanying Ensolite foam sheet material). It was cheaper comparitively priced against Dynamat - probably because it doesn't have 'Dynamat' logos everywhere (that costs more money, after all). I've seen Dynamat up close, and it's pretty much the same thing. With the two kits, I was able to complete the firewall, kick panel area, floor, and roof with approximately half of the 2nd kit remaining. I didn't use the Ensolite on the floor, since the carpet has jute/mass backing, as well as I installed some repop factory-style roof insulation before the headliner went in.
Since full coverage of the BXT II material (butile-backed aluminum sheets) isn't actually required for sound dampening (more like for thermal barrier protection), I should still have enough to do the insides of the doors, quarters, and trunk area. However, I did do full coverage on the firewall, floor, and roof areas to make a complete thermal barrier, because of the engine, exhaust, and West Texas sun.
Using the strategic 'strip' method (cut the sheets into 2" wide strips, and place them strategically on the inside of the exterior sheet metal) the placement and weight of the material will drastically cut down on the vibration-causing noise. The real sound deadening performance comes from the Ensolite material, being placed under the interior trim panels, much like the moisture barrier sheets (replacing them, ideally), sealing up the holes in the interior door panels, quarter panels, and trunk barrier.
I started with the firewall and made my way back:
Still need to do the doors, but here's the floor done with the HVAC installed:
Here's a link to their "How To" page: http://www.raamaudio.com/pages/How%252dTo.html
Hope this helps.