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.)
mcondon
I owned the Electrocompaniet AW-250 for a while and would have to echo Grannyring's comments on the sound. Warm yet with just enough detail and very deep bass. For solid state Electrocompaniet would be a good choice.
Mcondon,
i had the Ayre V5xe (very good) and a pair of Rowland 501 monos (which I thought were awful) on loan for two weeks awaiting my Ma9s2 (still waiting) and I would hands down take the Marantz sm11-s1 over both of them despite the price difference, if that is any help.

I am also a big fan of the MC275.......
Petland, thanks for that feedback. The Ayre sounded so good during the demo, but is too expensive and would require too many system changes (like finding a balanced preamp to replaced the single-ended Manley Shrimp and changing speaker cable terminations from banana plug to spade.) How does the Marantz compare to the McIntosh MC275? Is the sound quality as warm and non-fatiguing?
I recently discovered a little company called Plinius and may I say my p10 amplifier is among the best I've heard at pulling off just a trace of warmth without going overboard. Along these lines, perhaps one of their class a amps might float your boat (I have a class ab model). Wanna talk involving? Definitely one of the most involving pieces of solid state gear I've come across in 20 or so years- punchy, fast and just a touch warm- though less so than the first generation bel canto ref 1000's I used to own. They look the business too!
Lets just say the Marantz has been somewhat of a revelation for me.

I should preface by saying that transistors have not had much of a place in my system, at any level, for a long time. I still feel quite strongly that is far easier assembling a musically satisfying system around tubes than transistors and i have never been successful with transistors alone. The Marantz however has opened my eyes to how far things have come. That being said, the other SS amps I have had around recently are better than in years past for sure but still reminiscent of what I did not care for before. The Marantz seems to strike a note with me, even though its not easy to describe why.

I can tell you what the marantz is not: it is not dry or analytical or overly sharp or unnatural. It also is not warm, fuzzy, bloated slow or forgiving.

Now how well it may match with your speakers I cant say, not having heard them. With my 40.1, which are fairly neutral with a nice hard hitting midbass, the Marnatz was superb. What I loved the most about it, and which I hope is present in the 9s2, was its spatial organization. It was uncanny here. it also has speed with texture and dimension.

Anyway it should be on your list at 2k used although you dont see them often. I also found it to be very flexible with a front panel switch between the SE and Balanced inputs with adjustable input gain for both. i used both the balanced 101d and SE 6h30 outputs of my Supratek preamp into it and it was nice to have two different signatures in hand at the flick of a switch.