We purchased our mounted TV stand at Best Buy - it holds up to a 32" TV and it has the DVD player below the TV .
For the Big Boys? 42" and above? The wires go behind a vinyl cover that go down the wall to the outlets - that's what we have done...the vinyl cover can be painted the color of the room so it doesn't "stand out".
The DirecTV box and DVD player are in a stand below the TV with the XBOX.