You could always look for another Krell, and I’ll throw in Hegel (very high damping factor) and Bryston (SST2 or cubed models) as a couple others worth looking at for tight bass. Best of luck.
Belles Reference 350a. There's a good one for sale on USAM for $1850.00 I think. I'm not the person selling it. Very high damping factor, and great reviews in all aspects.
Big B&Ws, I don’t think you can get anything that would equal the performance, sound and control of the KSA250 for $2,000. You would need a big high current amp.
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