Amplifier Recommendation for Spendor D9.2 Speakers

Currently driving them with a McIntosh MC275 VI and wondering especially if solid state might do a better job.  Can anyone share their satisfying amplifier experiences with Spendor D9.2's?  What works best for you and why?  I listen to a wide variety of music so hard to pinpoint where I'd like to concentrate in that regard.  Open to mono and stereo amps up to $12K total, and open to pre-owned.