integrated amp for Wilson Sabrina X

I have the MA12000, but haven’t heard MA8950, or the Krell.

You have to add Pass and Boulder to the list. I would definitely consider Pass. Listen to both the X series and XA. The XA is much warmer and more natural sounding.

@ghdprentice +1 on adding Pass and Boulder. However the X or XA series are not integrated amps. 
That being said, Pass Int250 or Boulder 866 should definitely be added to the list as well as Gryphon Diablo 300. 
 

I own Wilson Sabrina (original) driven by Pass Labs XA30.8 amplifier. I heard the MA8950 in my system next to the Pass and prefer Pass. But that’s just a matter of taste. If you like McIntosh sound, go for it. 

Just keep in mind member “ghdprentice” has no love for McIntosh equipment. I have heard McIntosh electronics paired many times with Wilson speakers and the sound was always wonderful. 

If you go Mac try the 2ohm taps. The impedance is pretty low at 1.6 ohms. Similar to the dip on my old theils and the 2 ohm tap really helped soften the highs. 
 

also keep in mind if you use the 2ohm taps you might want the model up to get more power as it will lower the output by a 1/3rd I think. Don’t quote me on that. I would have to look it up.