Jeeez, my only thought is that after reading the subject line, I was scared the body of the text was going to be about massage.
I don't have any REAL helpful thoughts other than: When you are putting your speakers into an existing room, I think that room's existing furnishings and decor dictate the speaker finish. You're lucky enough to be planning a build around the speakers, so I'd just choose what YOU like best and let the room match the speakers. I could see going lower-than piano gloss if you're considering a projector.
