You should be able to tint the whole front windshield of you use the 3M crystalline tint... if you can find a place that has it. It's so light it doesn't look like it's tinted at all so cops won't hassle you, but it blocks most UV light. They have 3 shades of it, that only block like 10-15-20% of visible light if I remember right. I'd like to get that stuff put on my own car.

As for mirror tint, I've never used it myself but a friend had it installed on all his side windows and rear, and he said it cut down inside temps noticeably.