One thing to know about the Stereomour is that it has fairly low gain for an integrated, about 9dB, and I feel it really benefits from being driven by the Moreplay, which has about 11dB of gain. The combo gets you into the gain range commonly found with most integrated amps.
The Moreplay has two outputs, so can drive both your SEX and a Stereomour. I'm currently using my Moreplay to drive a Crack and a brand new Stereomour. I have also used the Moreplay to drive a Hypex Nilai, and ACA mono blocks. All of those pairings have been excellent, with the Stereomour being the best of the bunch.
Because the Moreplay/Stereomour pairing is so synergistic, knowing what I know now, I'm glad I built the Moreplay first rather than jumping straight to the Stereomour.