I think the brushed aluminum looks great, to be honest. Especially on that bike. The power coat might make it look, shall I say, a little duller?
Still, I see what you are thinking, bring out more of the black custom look. As always these aesthetic things are ultimately up to the owner... My own recommendation is to get a nice, shiny, matching black hugger. I got a matching hugger for my GSX-R1000 and no other mod made it look nearly as sweet. Looks like a whole different bike now. Almost Italian looking now. Seriously!