Tint help/info wanted.

I'm going to get tint put on my 23 Lairit BAP. I'm thinking just match the rear windows but I'm opening to going a little darker to help with keeping the sun out. I'm gonna get the moon roof tinted too. I have little to no understanding of the % numbers that people talk about. So if it was your what % would you go with? I know the % on the rear windows will be lower because it's already tinted a little from the factory.