One of the first lessons I learned (form my professor who had 3 grammys under his belt): NEVER EVER EVER mix with headphones.
The SPLs will damage your ears. Permanently if done for a long period of time at even perceptibly low volumes.
Headphones are literally injecting sound pressure directly into your ears.
Headphones should be used as little as possible and at as low volume as possible. You will end up blowing your ability to hear, especially in the high frequency range. Normal people don’t have to worry so much about this, but as an engineer you should.
Headphones in big studios are usually for A/Bing mixes quickly or for vocal booths. Use monitors at lower volumes instead. I know it makes you less portable, but it will give you better mixes.
For A/Bing: I recommend Beyer Dynamic cans and Sony MDR 7509s. Both are flat and revealing and will give you a different perspective then what monitors will.
Please keep the volume down tho. Being a deaf musician would suck.