Dan D’Agostino and ARC Ref. 10

leog2015
  Do you people think it will be a REAL step-up over my Rogue’s or shall I stay with tubes?

With the Ago having 100kohm input impedance, it's a perfect match for a passive. You could try this $49 one and send it back if you don't like it.
http://www.schiit.com/products/sys

Or the more fancy Shiit Freya, which gives you the choice of passive, tube or solid state outputs, and it remote as well as balanced or SE also returnable.
http://www.schiit.com/products/freya

Cheers George  

Should be no impedance match problems.
As the AGO is 100kohm input and the AR is is quite low (for a tube) output impedance

Cheers George