I had the V1 of the Sphinx and found it a bit cool sounding, though SF speakers, might balance that out with their warmth. I suspect it has also been improved from V1 to V3. I have not heard the doubt that it will drive your speakers just fine, but I would also look around at other integrated amps. And keep the DAC separate.
Of brands I have experience with, I think the Musical Fidelity M6si would be good, and I am a super fan of Audionet, the SAM G2 might be a fit for you. Lots of used options on these.

