I think the QS8s are a hands down no brainer. First, I think speakers on stands in a room are much more obtrusive than speakers on a wall. Placement of the speakers (lack of appropriate walls) is really the only justification for stand mounting them, in my opinion.
Add to that the fact that the QS8s have a 1/2 Octagon shape, they sort of blend into the walls better. They don't simply jut out like a brick the home builder left sticking out of the wall. The included T bracket is a snug, wall tight mount that is clean.
If the wife won't go for black speakers hanging on the walls, consider doing what I did, which is getting a lighter finish on the speakers and buying white grill covers - they virtually disappear on the walls (GTZ - check out my pics in the wall 'o fame for an example).
Others have posted about painting the speakers. You shouldn't hesitate to consider this as an alternative option, especially if aesthetics are competing for optimal performance.
