If you decide to go with solid state amplification, you might consider Aragon 8008 series amplifier. I own one and I am very pleased. I do not have Martin Logan speakers but several dealers have suggested to me that the Martin Logan/Aragon match works very well. Even though the Aragon is well under your price range of $4-5k used, you might consider it in the mix.
With that setup I'd go tubes all through. The Jadis 30, as suggested above has not enough power. Within your price range the Antique Sound Lab Hurricane monos,($4400 new) which HP raved about in TAS, would be ideal, I find. Don't go for less.....
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