Focal Aria 906 vs Totem Mite

Of all the amp/DACs you've been looking at, the Cambridge CX A 80 seems a good choice. I think you should go with the higher power (CX80) since the sensitivity of these speakers only ranges from 87-89dB.

The Mites are an impressive speaker; listening to them you never realize they're so small. (need a long break-in). Wide soundstage, good detail, but with any of your speaker selections, you'll need a subwoofer especially for classical.

I haven't heard the others, but if you're looking at the
Venere 2.0($1700), I assume you're buying used.

As far as power, I just realised the difference between 60wpc and 80wpc is negligible.

I have heard the Venere 2.0's and they are superb. The 2.0 seems to be the real sweet spot in the Venere lineup. You won't need a subwoofer either with its 7" mid-bass driver.
With your musical tastes, I would think these would be ideal for you. But go hear them first and then let us know what you think.