Hi Chuck,
Have you considered the Arcam A49? It's their flagship 2ch integrated and features some of the cleanest, most powerful amplification around via their Class G topology, which runs in pure Class A for the first 50 watts of power with A/B power in reserve for a total of 200w at 8ohms and 400w at 4ohms. They are right in the price range you are looking for at $5750 and will drive your Martin Logan's with ease...
Have you considered the Arcam A49? It's their flagship 2ch integrated and features some of the cleanest, most powerful amplification around via their Class G topology, which runs in pure Class A for the first 50 watts of power with A/B power in reserve for a total of 200w at 8ohms and 400w at 4ohms. They are right in the price range you are looking for at $5750 and will drive your Martin Logan's with ease...