Upgrade integrated within the $600 - 1k Range

Hi everyone,

I’m looking to upgrade from an NAD C316BEE. It’s a really great amp that I got for a song...but would like something with a more balanced presentation, detail and nuance. I’m running from a Digi Allo One to Schiit Modi Uber to the NAD then to Tekton Lore’s. Running very decent cables, mostly ZU Audio. 

Im currently considering Rega Brio, Music Fidelity M2Si,  Audiolab 6000A.  Others in the mix as well,  but these thre seem to stand out as good features and strongly rated sonics based on reviews. 

Has anyone here heard these or could recommend one over another based on my equipment? 

Hoping to ger out to some shops to audition anything they might have. And hope I don’t offend anyone here with my relatively low/muffin request here :)

Thanks ahead!