Thanks for link, but there are to many discussions, hard to find relevant info, i will be very thankful if someone who has same equipment will just direct me what to choose 

I need to buy some amp for this cruel headphones, budget is <200$, reviewing these three model (maybe something better exists) also looking on Asus Xonar Essence STX, i don't need portability and features just best quality of sound for PC Please advice best one to choose, Thanks