Get ones that are comfortable to wear for extended periods of time as well as comfortable to listen to. The only way is to try them on!
I use Sennheiser HD650 which have an open cup. Not good for tracking vocals with but excellent for long periods of listening. Very true sounding for mixing purposes, they don’t over-hype any particular frequency. Exactly what you want when mixing, you may perhaps have different rationale for recreational headphones. There are several pairs around this price range and cheaper that are probably equal to one another though so probably best to see which ones suit you best.
I read this guide when I bought mine:
http://www.soundonsound.com/sos/jan10/articles/studioheadphones.htm
Reviews and recommendations are great but best to try out different brands if you can as it’s a big investment.