There was to be an L3 two way. Have you ruled them out for surrounds in a 5.1.4?Considering trying the Monolith THX Ultra in walls for rears
I also think the Monoprice THX in-walls are likely to be a good speaker. The THX Mini-Tower which appears to be using the same drivers has been measured and well reviewed. I always worry about not being able to adjust height or angle with in-walls, but sometimes they're going to be the best choice to fit the layout.