If I may make a suggestion.
Don't get sucked into kidding yourself that they have improved after "burn in".
Personally I don't believe but even if you do be aware that it is very easy to convince yourself of what you want to be true.
Have a search for burn in on here if you want to see a never ending dispute!
Anyway. Another thought.
I recently auditioned all the Beyers with a friend.
We ended up preferring the Sennheiser 600 by miles.
A billy bargain in our opinion.
It's open so that's out.
How about making a virtue if necessity and trying IEM's instead?
Finally someone who is talking sense.
The amount of times I hear burn them in for 300Hours..Wut. It's just ridulous that people throw the words burn in around too much.
Here's my view on it.
When you buy a headphone things like ear pads have no been used yet and these can effect the sound. When the pads have been worn in which may take a couple of days then you hear some small changes mainly Bass response. Other things are getting used to the new signature, for example the V-Moda M100 have a soft sound that is not harsh in the treble. You pick up say a pair of DT770 and first thing you notice is the Treble is a bit bright. after a few days you hear it less because your ears are adjusting to it and people think this is because the headphones have "settled down"