sound deadener/heat shield: best bang for your buck, how many square feet?

[Orion88]

Before I redo my interior I figured I'd lay some sound deadening mats in my 79 C10. What is a good brand that's actually affordable? Things like dynamat and lizard skin are a little pricey in my opinion. I was leaning towards Eastwood or summit racing brand. also, how many square feet do I need to do my cab? The truck will have about as aggressive of an exhaust as you'd want in a truck you drive every day, and it will have a quality sound system by the time it's all said and done.