I have had Pathos Inpol 2 (bigger brother of your amp) and also had Pathos Classic 3 on loan from a friend, for a comparation.
It is a lovely sounding little amp and it is sensitive to cable changes. So, no matter what anybody might tell you, my first hand expereince with your amp is that it will sound 'better' with 'better' cables, rca or xlr, meaning, the xlr will not sound better, just because its balanced cable.
I am looking forward to hear gear that is made with that AES standard that Atmasphere (have not heard his stuff) mentiones when he writes about balanced connection.
P.S. I would look for some sh older upper class AQ cables (audiotruth), before later models that were often counterfited...