I use a lot of headphones for various different reasons.
Sony 7506, have used these and their forerunners for almost 20 years, and they still give the best overall frequencies and power. Most recommended. Good all-rounders. Spares available, can be fixed.
Sennheiser HD25, similar sound to Sony 7506, but less bright, great sound isolation, good for location recording, will stay put on head!! Spares available, earpads can be replaced etc.
Grado Labs (
http://www.gradolabs.com/) SR60 or SR80 (or higher models). These are amazing sounding headphones. Isolation not good as they are open-backed, but I like these for mixing and editing, comfortable and not fatiguing. Have blown up one pair, don't know if parts are available.
I chose these models for their essential similarity in sound, but their very different features.
regards
Stephen