Definitely look into some brands other than beyerdynamic...
Sennheiser: HD 600
Audio-Technica: AD900, AD2000, ESW9A, M50
Grado: SR225i, RS2i
AKG: K 271, K 702
Denon: D2000, D5000, D7000
I haven't heard most of these, but they've intrigued me at least once in the past. Whatever you do, I recommend you sell all the headphones you don't like or aren't using, determine your new budget, research some of the headphones others are recommending, and get ones that complement your current headphones, so as not to have too many similar-sounding ones.
Once you're done, the most important thing is to remember to slow down, spend time with what you have, and enjoy them!
Sennheiser: HD 600
Audio-Technica: AD900, AD2000, ESW9A, M50
Grado: SR225i, RS2i
AKG: K 271, K 702
Denon: D2000, D5000, D7000
I haven't heard most of these, but they've intrigued me at least once in the past. Whatever you do, I recommend you sell all the headphones you don't like or aren't using, determine your new budget, research some of the headphones others are recommending, and get ones that complement your current headphones, so as not to have too many similar-sounding ones.
Once you're done, the most important thing is to remember to slow down, spend time with what you have, and enjoy them!