you know buddy, if your looking for sound quality do you really think there is gonna be much of a difference?
are you going to be ablt to tell? the sound quality is already really good, i think all your paying for in this price range is a different sound signature.
untill you get into summit fi, but i cant tell you how much better that would be either since i have no experience with it.
What you could try however is to try out a open pair of headphones, that might satisfy you :)
hope i helped