Atma-Sphere M60 Matching DAC and Preamp

Hey there,

I have an Atma-Sphere M60 and noticed the input voltage is 3V, making me worry about the preamp and DAC matching with the amp. I'm confused because sometimes I see preamp and DAC outputs listed in dB of gain and other times I see voltage or references to current regulation.)

Ultimately, I'd like a well matched system and am thinking about two different combinations of pre and DAC:

If I can use the Denafrips Ares II, the DAC would eat into my $3k budget and likely would be looking at a tube rolled Schiit Saga+ with a nice replacement for the JJ tube. The Denafrips Ares II has 4V of output. The Saga + suggests it will output up to 10V with 0dB. 

Alternatively, I'm looking at the Tortuga Audio LDR3000x.V3 (potentially with a gain stage configuration) and the Schiit Bifrost 2 with XLR configuration for a 4V output max).

A phono preamp can be considered separately and later, just in case you're wondering. This will mostly be for streaming.

Thoughts and help are greatly appreciated! Again, budget is $3k.