Thanks for the suggestions,

Not sure what the plasma would look like with speakers attached to the bracket,
If I was to go down this route I would probably use something like the M&K Xenon LCR35s to keep it discreet with either the left/right on the plasma bracket or on the wall.

Although I do understand about the centre channel pulling the dialogue away from the monitor (I never could get this too work even with the Speakercraft AIM speakers).

However in-ceiling might still be the best option for aesthetic appeal.

Does anyone have experience with the Sonance Elipse range of in-ceiling speakers.