The left driver on my beloved Sony MDR-7506 headphones is slowly degrading (it has a slight distortion and crackling). I am now looking for a replacement.

I will get it repaired because to me it sounds crisp and awesome but I don't want to buy another one because the overall material used in the headphone is crap. It is a very hot headphones.

What do you suggest?

I don't want to stay around 500 USD.

Which one sounds closer to 7506s?

Sennheiser HD-660, AKG K-702, Beyerdynamic DT-1990.

I'm also open to suggestions.

Kawai MP7SE, Yamaha MOTF XF6, Yamaha WX5, Yamaha Pacifica 112v