Opinions: Martin Logan Renaissance 15a vs. Bowers & Wilkins 800D3

Thank you"boxer12", and "jollygreenaudiophile2" great advise. I am curious, if I consider mon-blocks instead of MAC's MA12000 integrated amp, say Classe Delta Mono or MAC MC611 mono-blocks, what will I gain besides cost more and additional cables? The two rooms my wife will allow me to expand are small roughly 13ft x14ft and I don't plan on playing loud. 

One advantage (a big one IMO) with going to separates instead of an integrated amp/preamp is the flexibility of being able to change one or the other out in the future. Also separates will likely give you better SQ with the B&W's as they are very revealing.  

How about a Mac receiver?

@farne230 What is the size of your room, and how far out can you afford to have the speakers from the wall? Properly set up, the ML can be incredibly holographic and engaging, with a wide sweet spot. The 800D3 may be more analytical, with a much smaller sweet spot. And both speakers will require about 5ft behind them to get the absolute best out of them. 

Wife said no to living-room so this area is out. Room 1 is a game room 16ft by16ft. Room 2  is 13x13.5ft.