Cary Audio DMS600 or 700 vs Bluesound Node 2

Hello all,

I have the BS2 in my system and wanted to move up to an Innuos Zenith mk3 but now I'm looking at the CA DMS600 or 700.  First, can I use the DMS as a streamer alone? This is how I'm using my BS2 now. I want to keep using my Anthem str preamp's dac, so I can continue using the Anthem Room Correction. 

My questions would be -

#1-Is this a substantial upgrade from the BS2? 

#2- Will I hear any difference at all if just using the server of the CA and using my own Anthem dac or just not bother and keep the BS2? 

I only use Quobuz for streaming now. The 2 channel str is connected to an Anthem mrx 720 5.1 system as well.