This is my setup as well. I'm renting the LCD-3, and it is set to arrive at the beginning of next month. I've been looking to upgrade to the 3 or X from the 2.2, but not sure which since I still haven't heard either. Eager to see your comparison. I wouldn't be thrilled to need a new amp and dac for every different headphone I decided to buy. :P
That's the question, isn't it? I like the LCD-3, but not enough to upgrade from my LCD-2. I'm looking for the Audeze voicing with a bit more air and treble resolution--but with the LCD-2's bass punch. Fingers crossed that the LCD-X will fit the bill. My Gungnir is definitely probably staying, but I'm keeping an open mind about the Mjolnir.