advice on amp - $3,500 maximum budget

I am looking to buy an amplifier that would be a good match in my system. My speakers are Sehring 703s. They are not well-known in the US, as they are German and primarily marketed in Europe. They are 86db sensitivity at 8ohms, but supposedly have a fairly stable/forgiving impedance curve, which means they are not that difficult to drive. My preamp is a Manley Shrimp. I live in a New York apartment and the amp has to go into a cabinet, so very heavy tube amps are out of the question. But I am looking for tube-like warmth/bloom. (FWIW, reviewers of the Sehrings say they sound best with tube amps.)

Right now, I am considering the following amps:
1. Music Reference RM-200 -- a hybrid tube amp that doesn't weigh too much or get too hot, 100w per channel. Some say it basically sounds like a solid state amp but has all the hassles associated with tube gear. Others say it sounds fantastic. Main concern is that Music Reference is a one man operation run by the designer, who is frankly hard to reach a lot of the time.
2. Blue Circle SB100S -- solid state, 100w per channel. This is the lowest end power amp Blue Circle makes. Reviews are generally good, but provide generic praise rather than incisive comments. I am a little concerned that I could get the essentially the same sound quality for less money from a bigger company.
3. Butler 2250 -- a powerful 250 watt hybrid amp. Provides a lot of power but also some valve warmth as well.
4. Bryston 4B-SST -- supposed to sound good and I like the idea of a 20-year warranty. Reviews suggest it may be a little bright/forward, which causes some concern. But value holds up well in the used market, so I could probably sell it without taking too big a hit if I don't like it.

Any thoughts on the relative merits of these amps and whether I have left off some obvious candidates in my price range? (I am trying to avoid Class D, although I do plan to audition a Bel Canto to see if my concerns about compatibiity with my speakers are misguided.)