I saw an entertainment unit at Crate and Barrel the other day that had a similar base as yours (from previous posts showing pics of your two setups) and a back board that looked stout enough to accept a wall mount for a plasma. That might work for you because you might be able to mount the plasma high enough to fit the center speaker under it. You also could make or purchase a back board that would fit your current unit and plasma. Just a couple of ideas...