I appreciate the input jadnashuanh. I hear your points and am aware of the "tech specs" for the brands. I think Llumar's FormulaOne sister company makes a good product with their Pinnacle line. The other big contender for me was SolarGard's top of the line tint. My reasoning was that it was another "good" tint and that is what the other local installer, with a good reputation, uses. I decided to go with the FormulaOne Pinnacle because heat rejection was my primary concern and the manufacturer rating (according to themselves) was blocked the greatest amount of heat.
My post was really about how dark to go and what thoughts were on visibility. For what it's worth, my car is grey with a black interior, which tends to make tint look darker. It also tends to burn the hell out of you when you sit on it too though! The back of my legs and my hands are burning just thinking about it!