I was gonna say Huper optik as well. It's DAMN expensive though, but worth every penny. 3M makes some good stuff too.
Keep in mind, you put 35% film on bare glass, it will read darker on the meter. OEM windows are about 70-80% VLT, so tossing 35% film on NET's you around 25-28% VLT on a meter.
Most states are 35% NET, so you'd need 45%-50% film to meet that requirement.
Sucks...i know