So...this is what we have decided:
I get to keep the front Paradigm Studio 60 but replace the surrounds with in wall and add an in wall rear center.
I'll go with either Paradigm Studio SA-30, B&W CWM 800 or PSB CustomSound M6X6.1 in-wall speakers (they are available in the area for audition).
I'll let my ears decide.

Again thanks everyone for responding to my post.