RAAMmat is another excellent deadender, and the owner is an awesome guy.
Each of the products mentioned, with the exception of PnS, come in thicker variations. I'd reccommend going with the thickest you can get so you only have to cover an area once, and the few areas you might want a second layer will be few and specific. The thinner stuff is easier to work with, which is nice for cramped areas like inside the doors, but for big areas it takes too much time and layers to get ample deadening.
Deadening a car is a long tedious process. Well worth it mind you, but for your size car, especially if it's a 4 dr. you might as well write off a weekend. Use a heat gun, or at least a hair dryer (takes longer) to help mold it. If you can con a friend to help, all the better.
Have fun.