Pre amp recommendations

My current setup 

Gr Research NX studios with 2 subs  

PS Audio M700’s amps

Denefrips Pontus dac

Bluesound Node. Streamer
Anthem AVM 60 surround processor 

i have good cables and XLR where possible  

So, I’ve been upgrading recently and I have to keep my AV system integrated with my 2 channel system. I am very satisfied with my system now but I keep wanting to improve it. 
I believe my Anthem is the weak link here. 
I’m looking to install a dedicated 2 channel pre amp with theater bypass. I’ve been looking at Musical Fidelity M6s, PS Audio Gain Cell, and Parasound P5 or P6. 
Would this be a worthy addition?

I have a Parasound 2100 pre laying around but I feel it wouldn’t be an improvement over the Anthem AVM 60 processor.