As Alex & Sdcampbell both said, the Quicksilver products are superb. Their Mini-Mono's have a very open sound, eerily close to that of SET (single ended triode), which has an intimate, holographic midrange. You can use a variety of tubes with them, and they are self-biasing. They would easily power your system in that 12 x 12 room, and if you like them, I would suggest trying them out with a more efficient speaker. It would be worth your time to hear them with an older Klipsch Heresy or Forte, especially on the music that you like.
There is a pair of Mini-Monos for sale at $525 here (they usually go for $700 or so). They are exceptionally good amps. You can pick up one of their preamps for around $500-600 used, and even if you play around with NOS tubes and upgraded power cords, you will be well under your budget.
Another superb amp is the Audiomat Arpege. Incredibly musical, and about $1250-1400 used).
Also, If you have not heard SET amps, and you like class A, I would recommend giving them an audition. Like many people, my wife and I became completely addicted to their holographic midrange. You will experience their full benefit with a more efficient speaker, particularly because many of them are between 3 and 12 watts, but they sound absolutely magical. We generally play our 7W SET with our 104db horns, but with our 95db Silverline speakers, Pink Floyd etc. sounds fantastic. However, it's with jazz, vocals and classical that they really shine.
Hope this helps.
Howard
