You mentioned tube amps. Not sure if you meant that your aren't interested in tube amps or if you meant so say "don't recommend tube amps." I'm a tube amp fan because they tend to be the most transparent bringing all the details most clearly to the listening chair.
Your speakers are not a good match for tube amps because of their low efficiency. There are tube amps that put out enough power but the lower power tube amps seem to dance to the magic better.
I just bought an ss amp because all the reviews make it sound like a tube amp. It was inexpensive so I bought one to listen to. Haven't received it yet but you might want to consider the Kinki EX-M1+.
If you're trying to "soften" the speakers like ezikl suggested then I'm not sure a super transparent amp is what you're looking for.
Jerry