UPDATE!
Long story short, I got my hands on some sennheiser momentums as the X2s were out of stock. Fantastic headphones. I love them. I couldn't avoid buying the X2s when they came back in stock though. So I bought a pair and a Schiit Fulla DAC/AMP. They are crisper, sound more put together on the louder end than the Sennheisers and have that open sound I've never experienced before. A sound that allows the music to leave my ear once it is played instead of bouncing around inside the cushions for a while. Unfortunately, they are also itchy, clunky, and not as comfortable. Honestly, I like features of both sounds so I'm not hugely swayed by one or the other. The comfort of the Momentums is amazing though.
Sooooo, I don't know what to do. The HD 600s are on sale so I could snag those and
Definately keeping the Fulla AMP though (would it be enough to power 600s?)
Does the itchiness go away?
I’m trying to decide if that great sound (but not AMAZING per-say) is worth the extra $150
P.S. I'm curious. When I got the X2s for a lot of tunes at first it sounded like there were little crackles in the back. I burned them in by playing them stragithw hile i was at work and asleep for a few days. But I don't know if those noises went away because I burned them in or becuase I got the DAC/AMP.