I been using this one for a year now. Yes they are good. But now for some reason I am looking at lcd3, hd800, and stax. If I spend 2000 bucks is it over 10 times better then the ma900? Got mine for 140 new.there is a place called headphone bar maybe I should go have a listening session first. Right now I can't even tell the difference between stock xonar stx and o2+odac.
To be honest I doubt the difference will be that big. The only one who could decide if the price jump is worth it is you. So I suggest going into a store and trying out every headphone for yourself. Don't take advice about hi-end headphones from here as things get very subjective and it's all a matter of preference.