Well, it wasn't an option in the poll, but I went with 30% on the front side windows, and 15% for the front strip.
I think that the darker it is, the better it looks, period. But ANY tint on the front windows is illegal here, so I'm taking a risk just by doing the 30%.
It looks pretty good next to the factory tinted back windows, and I'm hoping I'll get away with it.... haha.
...Any darker, and I know I'd be getting pulled over all the time!