I appreciate the input, guys. Sounds like semi-gloss is the way to go. I'll have to order a couple of samples of the darker stains and see what I like best.

The only disappointing thing is that I'll only ever be able to justify the expense of replacing the normal channels, not my subwoofers. They would cost waaaaay too much to replace unless I suddenly get rich. I'll have to figure out a way to make them look good alongside everything else in the room.