I used to play mine with a very updated Audio Research VT-60, which probably did not control the bass like a good SS amp would.
At the sub $1k mark, I suggest something like a Belles 150A Hotrod, OCM 200 or 500. Some of the updated Hafler 500 amps sound very good too. You can find all of those amps at less than $1k. Another line of amps to consider are the older Coda amps. Sometimes you can find a nice Coda 10 or 10.5 in the price range you are looking for. They are very sweet sounding and can nearly drive a short, so the Thiels impedance issues should not cause them to sweat. I am not a big Krell fan because of all the inherent buzzing ground loops that they seem to have had each time I owned one, however I have heard good things about the Krell KST-100. Some have said it is more musical than a lot of the KSA's and it is Class A/B so it won't eat itself like the KSA's can do.
I hope this helps.
At the sub $1k mark, I suggest something like a Belles 150A Hotrod, OCM 200 or 500. Some of the updated Hafler 500 amps sound very good too. You can find all of those amps at less than $1k. Another line of amps to consider are the older Coda amps. Sometimes you can find a nice Coda 10 or 10.5 in the price range you are looking for. They are very sweet sounding and can nearly drive a short, so the Thiels impedance issues should not cause them to sweat. I am not a big Krell fan because of all the inherent buzzing ground loops that they seem to have had each time I owned one, however I have heard good things about the Krell KST-100. Some have said it is more musical than a lot of the KSA's and it is Class A/B so it won't eat itself like the KSA's can do.
I hope this helps.