Look into Sanders Sound Systems. They specialize in Electrostatic systems. This company used to be called Innersound. They have a nice preamp/amp combo you may want to check out.
Amp/ preamp for electostatics and why
I would like to get some ideas on what amp and preamp sound best with electrostatic speakers and does the brand of the speaker make a difference? Do they like high current or high voltage better? I am running a pair of Martin Logan SL3's with a pair of PSE Studio V monoblock's and a BAT VK-30 pre right now but would like to play with the sound. also wondering about changing tubes in the pre.