Well its something to think about. Thanks for the measurements, I looked up the thickness of the TV (3.9" at its widest), and 2.5" for the tilting mount. So 6.4", however tilting the TV downward will less the bottom half of the TVs distance from the wall to around 4-5", which is exactly what the amount I am expecting the VP150 from sticking out.

My only concern now is the fireplace looking retarded flush against the wall, while the TV and center speaker protrude a few inches from the surface of the wall. Maybe I should build a simple mantle, or see how it looks first, can always build one afterwords.