I liked the idea of a black paint job as well.
I bought a 4 a few years ago that had dark blue on the wings. It was extreemly hot in the sun while the white was barely warm. This changed my mind on the scheme I had planned for my 7. I decided I did not want a dark colour on the tanks heating the fuel and possibly causing vapour lock and oil canning issues so I limited the black to the fuselage. No heat issues so far and the dark belly hides the breather mess till I get it cleaned. The guys say it is very visible in the air which is a nice bonus.
Good luck with your paint job!