opinion on tint / oem tint

[cubanbeer]

i just got my m sport 48i, need to tint windows but don't know what percent here are some ideas. My old x5 had no oem tint and i did 13% all round except the windshield (any thing less than 35 % illegal here)

1. 35% on front sides to match oem
2. 35% on front sides to match oem but very back windshield with 15%
3. 15% on all windows except windshield

I have the rear climate which added stock tint, anyone know how dark that is?

Any input would be appreciated and no i don't want too dark like limo tint.