Replacing a good SET amp in the price range you specify isn't easy. Despite the inherent limitations of SET amps, they can indeed impart a certain magic to music, distortion and all.
I've moved on from SET. I found my destination amps with my Atma-Sphere M-60s. I had the M1 power supply and Vcap upgrades, and spent some effort in selecting driver tubes. It is fed by a 101D based tube preamp. That set up got me all the virtues of SET and none of the limitations. No looking back for me. But that option is outside your price range.
Ralph is not blowing smoke on his comments on what is really false dynamics in SET amps.
After my SET amps got bumped from my main rig, they went into my downstairs living room system. After spending a couple of years there, they got bumped again, this time by a Lyngdorf 2170 integrated. This is a class D amp that also contains a really good DSP feature. It is an amp that is hard to characterize. To my ears, it doesn't sound like SS, but it doesn't sound like an SET tube amp either. IF your source material is digital, and if you can benefit from digital room correction, this might be something to consider. You can get one used under 3K. It is not anything special in my estimation if you are an analog source guy.