I have an MRX720 it's great. 7.1 or 5.1.2 out of the box {dual sub}.
If you can get a deal highly recommend. Even before I ran ARC sounded really good.

Originally I mentioned the NAD 757 as it has similar specs. to the 720. With 7.2 channels out of the box and ability to add external power if you so wish to go full ATMOS 7.2.4 later.

Here in Vancouver the NAD is 1499 while the Anthem is 2499. Not sure of your location though I would expect similar as they tend to keep it somewhat universal per country.
Unless of course you land a deal
Also here in Vancouver NAD is much easier to find than Anthem.