I've had good luck with Parsound, I own a A-51 five channel amp for my HT, if money is a problem, the A-21 also performs well..much less expensive than the Mac, and very reliable. Sounds like you put together a nice new HT. Which Marantz did you get? Is that the Samsung 4k monitor? Any discussion on 4k content for your new monitor?
Best,
bob
Best,
bob