One other thought I've had would be a Pass Labs amp, like the X150. Just a thought.
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From what you've just said about your preferences, I'd also throw in my vote for the BC28 from Blue Circle.
It has pretty much all the qualities you're looking for.
If you do choose the BC28, make sure you LEAVE IT ON for at least 4 days before you make any firm conclusions about it's sound. I've had the BC28 in house for a couple of weeks, and was only marginally impressed with it initially (compared to my BC8 mono's). However, after a week of simmering the 28 changed so dramatically that I would not have believed I was listening to the same amp ! And as a matter of fact, it's pushing me towards updating my BC8's to include some of the same technology.
What preamp do you have? A neutral and quick preamp is probably fine for a BC28, though I've heard a BC28 with a few different Blue Circle preamps, and depending on your taste, you could be happy with any of them.
I am currently using a 10 year old Aragon Aurum with my Blue Circle amp, and the two of them are getting along quite well. I'm sure there are lots of preamps you could use effectively, but I would always try to pair a Blue Circle amp with a Blue Circle preamp.
Having said that, whatever amp you do decide on, you might just want to run it with your pre for a while and see how you like it. You may find that you don't need to upgrade your preamp.
I don't know your pre, but if you're fairly satisfied with it consider making your source the next priority. I've used my BC-28 with both ss and tubed preamps and feel that its transparency reveals source capabilities and flavor to a greater extent. I'm currently using a Pioneer Elite PD-65 cdp (highly modded for transport use)as a standalone source while my DAC is being upgraded. The BC-28 very clearly passes along the the difference.