Labtec -
Congrats on your new Martin Logans! I'm a Sound Lab dealer, which means I also specialize in amplifiers that work well with electrostats.
My personal opinion is that, wherever possible, electrostats like to be driven by tubes. If that isn't possible, then three solid state amplifier lines that work exceptionally well with electrostats are InnerSound, Clayton Audio, and Warner Imaging. They have different qualities, and offhand I'd suggest the warmish Warner Imaging amps as the likely front-runner for use with your Requests. Among solid state amps I don't carry that I like are big Pass Alephs, Boulder, and older Jeff Rowland.
In tubes, you have many options. I happen to carry Air-Tight, Atma-Sphere, JoLida, and Wolcott - all of which offer models in your price ballpark that would work well. Other tube amps that should work well with your Martin Logans include VTL (preferably 450 and up), Audio Research (larger models), VAC, and KR Enterprises.
You have many options, and far more right choices than wrong ones before you. Which amp is right for you depends on your listening style and what qualities matter most, as well as what imperfections are most objectionable. So before making a specific recommendation, let me ask you:
How loud do you normally listen? How important is an occasional foray into extremely high SPL's?
What colorations are you especially sensitive to? For example, I can't stand upper midrange/lower treble emphasis, which tends to make close-miked female vocalists sound too forward and even harsh. What are your pet peeves?
Are you willing to consider used or exotic/discontinued amps if the price is right and warranty service is available?
Best of luck on your quest!
Duke LeJeune
AudioKinesis