I'm finally getting tint on my car. I've never had tint done before so I need some help. The guy asked me if I want 20,15, or 5. I told him that I don't want it really dark so he said I probably want 15. He also asked about the strip on the windshield but I told him I didn't know. What would you all suggest? I want dark enough to help block sun but not so dark it causes problems seeing at night. Also would you all do the windshield strip or not? Thanks!