Update after visiting the competition. We watched 5 mins of a movie in a demo room using Klipsch speakers and an Onkyo amp with the SVS sub (2000 I believe) and it blew us away. Even THE Boss was impressed. They used the Klipsch Atmos speakers at the front of the room on top of the towers and it was 10x the sound we heard from the MA. It was in a custom setup room with all the sound baffles etc but we could tell even in our setup it would be a major improvement over the MA's.
To my surprise (and I'm sure for some people here), they recommended we keep our front and centre speakers and only replace the Amp (Denon X4700H) and rear + add the Amos. Big saving on price. Although I did mention I'd like to hear the difference using a new centre given I'd still be saving money. They will check our location tomorrow hopefully and once I get a firm recommendation on kit I'll repost with room layouts etc to get further advice.
BTW, they demoed a $300k Amp and Tower combo they had setup for the more discernible (and richer) customers and we couldn't really tell the difference in sound over the demo'd home theatre system. Good for my budget.
Thanks again.