Warmest? BAT VK200, Classe CA200, Mccormack .5

Can't help you regarding the comparison question but I had to remark about McCormack's. They have a very warm, dynamic & musical sonic signature when paired with the right speakers, cables, & AC cord, which did require a fair amount of experimentation. I added some other tweaks (Vibrapods, Black Diamond shelf, cones) the amp always responded to any tweaks/changes, sometimes better / sometimes worse (just as you'd expect) my point being that they are highly tweakable to achieve whatever sonic charactaristics are desired. Nice very affordable line of equipment. Works well with a Custom Power Top Gun HCFI AC cord straight to line.

I recently switched from a DNA 0.5 to 0.5 Rev B. Amazing step up in terms of soundstaging, bass extension, and high end detail. However, even with my Vandersteen 2cis and BAT VK3i, it seems ever so slightly bright now. Using Silver Sonic t-14 shotgun biwire. Haven't heard the others. Just thought you might want to consider the Rev. b.

I own the Classe CA300, paired with Vienna Acoustic speakers. I've been told that Classe is a good match for Martin Logan, due to the smooth sound of Classe amps. I love my CA300.

Having said that, I have not auditioned the BAT or McCormack under controlled conditions, so can't help you directly with your comparison. I do believe BAT has a reputation for being less "warm" or "euphoric" than other brands of traditional tube gear (such as Conrad-Johnson). BAT has a great reputation, however. Had I not purchased Classe, BAT would perhaps have been my next choice.

I've got a McCormack DNA-0.5 Rev. A and I would categorize it as incredibly neutral. If the material is warm and lush it comes through that way and if it's etched and bright you get that too. Given that, I'm not sure it would provide you with what you're looking for. Don't have any concrete info. on the others. Best of luck.

Tim

go for tube amps if you can as they will give more ''body'' to the martin-logans. or a tube pre with a solid state power amp.
good luck !