What Sherwin Williams exterior white paint color would be best for a north facing home that has a lot of shade from a covered porch? The door is tricorn black. Fixtures such as porch lights and the door handle is brushed brass. For example: SW pure white, SW snowbound, SW extra white, SW alabaster to name a few. Also, what finish is best for exterior? Gloss, eggshell, satin, semi gloss, matte?