If it would fit your budget, I would recommend an Innersound ESL amplifier for Martin-Logans, or any electrostatic speaker. It is made specifically for the capacitive load of an ESL, and drives them with ease, providing control and great dynamics, with no distortion. It is rated at 300 watts/channel into 8 ohms, and 600 into 4 ohms, with lots of current. This is an amp that will drive the M-L's to their full potential, and once you nail down this synergistic amp/speaker combination, it will allow you to really hear what the front end components are contributing, and make your choices there easier. Current Audiogon price is around $1700 for this amp. I personally would recommend a tube preamp for the dynamics and realism that it can provide. Possibly a pre-owned B.A.T. VK-3i, or a Sonic Frontiers SL-1 would work for you; I think they both have a H-T "pass through" feature, making them suitable for dual use.