my 2 cents
of your candidates, i would favor the hegel h390 - it is brilliant, and if your source is really good, i believe you will hear a difference going from the pathos - the h390 is has power/control to spare, yet also the sweetness, correctness of tone, nuance and utter blackness of background to please at lower volumes as well
the other choice would be the pass, but the int25 is power limited, and you have stated you want more power into the sf 4 ohm load
of your candidates, i would favor the hegel h390 - it is brilliant, and if your source is really good, i believe you will hear a difference going from the pathos - the h390 is has power/control to spare, yet also the sweetness, correctness of tone, nuance and utter blackness of background to please at lower volumes as well
the other choice would be the pass, but the int25 is power limited, and you have stated you want more power into the sf 4 ohm load