I have the same setup as you, SL-3/Audio Research LS3 (non-balanced) & running a Classe CA200. try this amp before you buy, they can be had for less than 2K used and are a great value. havn't heard your other choices.
Amps for Martin Logan SL3
I'm looking to upgrade to a higher end used SS amp. My choices are Conrad Johnson MF2500, BAT VK200, Innersound electrostatic amp. Any of you SL3 owners own or compare these amps? I'm looking for a warm and non fatigueing sound with dynamics and great bass to make my SL3's wake up and come to life. I originally wanted to upgrade the preamp as well but $$$ is limited right now. My spending limit is $2K and my preamp is an Audio Research LS3. I appreciate the suggestions fellas.