Best high current SS Mono amps

I am searching for the best SS amp for 4 ohm electrostat speakers. I would consider tube monos, but I just can not take any buzzing or humming those tube amps have from time to time. I have a very quiet room and often play at low volumes.

Please help me out with your thoughts. I have spent a lot of time on the archives and I just can't tell what to buy. I would like to spend no more than 11,000 used on some balanced monoblocks with high current.

If there is a dead quiet tube amp that fits the bill, please mention it.