to the OP - if looking to keep the budget below $1,000, I can wholeheartedly recommend the Sunfire Stereo amp (either the 200wpc or the 300wpc Signature ) as a good match for the 'Logans.
They have tons of current reserves and never get warm, even at high volumes. Look around on the used market regularly, as they come and go very fast.
They can even handle driving the step-up transformer directly, as they do in my setup where I've bypassed the factory passive crossovers.
regarding Sanders, I will attest to the fact that the combination of his speakers and Amps are first class, so he must know something and things right. His amps deliver excellent results and there are many very satisfied ESL owners using them, even after comparing to high-end Pass and Krell amps, they stick with the Sanders.
More info on MartinLogans and what people use to drive them can be found at the MartinLogan owners site