Best Amp to Pair with Monitor Golds

Hi All, I bought some Monitor Audio Golds in 2014 for a 2-channel set up in our main room where we listen to music. The amp my dealer paired with it at the time, probably due to budget, was a Marantz SR7008. We are now re doing another room where we are going to have a home theater, so I’m going to move the Marantz in there (which is more what it is designed for anyway)  and upgrade the amp on the 2-channel system. My sense in listening to other systems over the past year is that I probably haven’t  even really heard these speakers’ potential yet, so I’m excited about the upgrade.

Over the past four years that I’ve been listening to the Golds I think they run a little bright in the mid to upper range and that the lower range is a little muddy, probably due to the Marantz. So I was thinking a neutral to slightly warm amp would be a good match.

Amps I have listened to or am considering :

NAD BEE series separates (have not heard)
NAD Masters separates (have not heard)
Musical Fidelity Nu-Vista 800 (have heard on Paradigm 8Fs - being offered at a great price)
Musical Fidelity M6si
Anthem STR
Classe CP800v1 / D200 separates (also at a great price)
MAC7200

I have spoken with several people who really love Luxman, and Bryston, but no dealers in my area who carry them. My understanding is that the Bryston is very detailed and controlled, but unforgiving without the right front end. Luxman very musical. 

I use a Bluesound Vault2 as my main source, though I have a Thorens turntable as well. 

Any thoughts from the group? Thank you in advance for your feedback.