I have used an Anaxilus modded HD800 with the Mainline and they are a great sounding match. I blew my stimulus money on a pair of LCD 3's which noticeably outperformed the HD800's with better sealing around the ears, deeper and more solid bass, more detailed mids and highs and they have become my go to cans for Mainline. The LCD's are nicely constructed of metal and wood with very little plastic and are heavier than the all plastic HD800's which may or may not be a problem. They make the HD800's look and feel chintzy which they are definitely not. The HD 800's have since become the main cans of my upgraded Crack and make a wonderful sounding pair. By the way the LCD's low impedance (110 ohm) doesn't sound as good with the Crack.