I found the audeze lcd-x to be a little more preferable to the hd800, very close though. I run my X on the apex peak/volcano. The apex pinnacle, allnic, cavalli and crayon amps are more expensive than the BA but I have no idea whether they synergize with the hd800.
If it were me personally I would look into purchasing the lcd-XC for a closed/planar compliment to the hd800's and call it a day.
Don't forget the Hifiman HE-560, I expect great things from that one.
I've personally found the LCD-2/3 too heavy and uncomfortable, and the soundstage too cramped. I've heard that the LCD-X improves on the soundstage but it's still really heavy, I would like to hear it though before I completely make up my mind.
But my gut tells me that I shouldn't be surprised if 6 months from now the HE-560 is the default recommendation in the sub $1000 category.