If you go 35% you won't get bothered. It's not dark enough for cops to pull you over because they an still see you, but it helps with the glare from the sun coming through your window. You should do it, it looks way better than clear.
The legal limit for the front here in CA is 70% so if they don't bother people with 35% here, they won't bother you where you live because you can legally go darker than us.