PrimaLuna EVO 400 v Cary SLI-100

Rogue Audio Dark Integrated (about 100WPC)

I also like any number of Line Magnetic integrated amps. I have the 216i and also have the non dark version of the Rogue (Atlas Magnum III). I have heard another Cary model and for some reason did not connect with the sound. I still think Cary makes fine tube amps. I also heard a Primaluna integrated and felt the same way. I think the key is to find a way to listen to these brands. BTW tubes are intoxicating. You have been warned... (hahah)

Decware with those Heresys

A great idea. I slowly moved into tubes over the decades as I upgraded my systems. I wish that I had done it faster.

Primaluna will be more neutral and the Cary warmer, more tubelike and musical.

I would recommend listening to an Audio Research I-50 before you buy. Incredibly musical and natural sounding with much more rhythm and pace than the two you are considering or other recommendations. This amp produces music. 

If you could hear a Raven Audio Osprey with best tubes setup

you would be amazed at what you hear..

Good Luck in your Tube Amp Search..