I own and sell electrostats, and tried an Aragon amp with my stats and found the sound to be a little on the thin side. I haven't tried the Marsh amps. After a bit of shopping around I chose to become a dealer for the InnerSound amps, so I guess my vote is fairly predictable. InnerSound dealers are typically quite willing to provide an in-home audition, so if you have a local dealer see what he says.
Best of luck to you!
Best of luck to you!