Hi! You might want to try a Sunfire amp since the design works well with electrostats, has plenty of juice and runs cool. These can be picked up on the used market pretty cheap. I am using the Sunfire with SL3s in my HT setup, but mine was upgraded with Cardas binding posts and Kimber wiring by the dealer when I originally purchased it. The Signature model provides even more power and has been favorably reviewed by TAS, but will cost you more.
Good luck! R
Good luck! R