a $10k budget? there is almost too many options of mixing and matching!
lots of good suggestions so far: Pass labs, Luxman, Atmasphere, ARC, Allnic, etc.
Dont overlook that Allnic that @soix suggested. It is an $11k tubed Pre that is selling in the classifieds for a paltry $3500 or so. Soix might be the seller, but no big deal. If I had the bones, this is what I would buy, or a tubed Atmosphere with a SS amp.
but I agree that a hybrid system is more called for her b/c of the Lumin server DAC that, although is highly reputed, is still a "digital" device with a vulnerability of sounding too etched on the high end. and b/c an owner of the Revels noted a vulnerability of the tweeter sounding a bit too metallic.
But you dont want Class A, so you can cross out the Pass Labs options.
I dont blame your not wanting class A, I use Class D amps currently to keep the heat down and the energy bills down. Consider a quality class D amp with a tube or SS preAmp, like Bel Canto REf600 monoblocks, or any of the designs that are well-reputed on the Audiocircle website forums (D sonic, James Romeyn, etc). look for the NCore switching designs, they are particularly good.