I'm about ready to get my seats re-upholstered, and I've wanted to get them covered in some black material... Only thing is several people have been telling me that I won't like it because it will be too hot in the summer with the top off. Anyone have a convertible with black seats??? Is it really all that bad? Too hot in the sun? Should i consider going with a charcoal grey? I like to keep everything interior black. ?