My full review is coming in the next week or so but to summarize - dual CMA800R really brings the LCD-3 to another level, and also sounds exceptional with HE-6 and HE-500. It makes a difference with HD800 but the improvement is nowhere near as drastic. I think just one of them already sounds so good with HD800 that maybe there just isn't as much room to improve.
Very very curious to read this. I just posted up my review of the Nuforce HA-200 monos earlier today.