Best Used Solid State Amp for less than $5000?


I'm sort of toying with the idea of upgrading my amp (threshold S300 - I know, its old) and the one amp that jumps out is the pass X250 which seems like it can be had for about $3000 to $3500 on the used market. Is there anything else that comes to mind? I can't afford the Tenor hybrids and even the Lamm SS's are about $7 to $9K. The rest of my system is as follows:

CF PFR
Fanfare FT-1
Parasound Ultra 2000 CD
Nakamichi DR1 deck
Stax Lamda phones
Sota Star table w / emt
Pass Aleph ono phono
Hales T8 loudspeakers

Would appreciate any suggestions you may have.
russellrcncom
Russell,
I am not clear on the preamp in your system. The pre in combination with the amp is very important.
I think he meant CJ PFR (Conrad Johnson PFR) which is quite a good little preamp. Rowland Model 10 would get my vote too although I didn't get to hear it for long. The McIntosh MC352 is excellent as well. Arthur
Thank you for all the wonderful suggestions. It really opened my eyes.

Where am I headed? At this juncture, I'm leaning towards the Spectron although I am also intrigued by the Stellavox (PW1). If anyone has info. on this amp I would appreciate your thoughts.
I own the Ayre V-5x - and I second Noble110's reccomendation, it is a wonderful amp, but you may also want to check out the SimAudio W5. I think both of these amps can be had around $3200 used, purchased new, the W5 is $5k (I think) and the Ayre is $4500. If the Hales are a difficult load, the W5 has a little more punch.
The Goldmund Stellavox amps are simply sunning in every sonic respect. They sell for $3600 to $4000 new, and are worth at least twice that amount. What about these little amps makes me say this? For one, they are ultra fast amplifiers, with clean and uncluttered articulation of the most demanding material. They have a solid bass, and a neutral to slightly forward midrange with detailed highs. After 100 or so hours of burn in, you get the most amazing layered and 3 dimensional soundstage very much like a quality tube amp such as the better Cary or CJ amps. Yet, these 200w RMS monoblocks are only 10lbs in weight and about the size of a hard back book. I hate to rave about anything in the audio world, because I have been around a long time, but these things are worthy of some praise.