Bob I think 30-35% is standard for Indiana. I was thinking about 30% on the front and 20-25% on the back.
Car-Teks on US41 (west side of the road, about 1/3-1/2 mile south of US30) came very highly recommended by a professional auto-restorer.
I talked with them, they have 5% limo tint, 20% and 35%. They have regular and ceramic in all 3 tints. Ceramic is roughly $240, regular about half that price if I remember correctly.