open or closed headphones? Open headphones usually have better soundstage and feels more "airy", closed headphones usually have better bass, or atleast more punch in the bass. Open back headphones are generally seen as better than closed back, but of course you sacrifice isolation.
Anyways I've read great things about Philips Fidelio X2, I haven't tried them myself though.
http://www.head-fi.org/t/723025/philips-fidelio-x2 (search this thread for comparisons between dt 770 and X2)
Sennheiser HD 598 are very popular headphones aswell, not sure if they're as suited to gaming as dt 770 and X2 though.
Whatever you choose I recommend you to try out the headphones you're interested in, if possible. I was set on buying the DT 880s after just reading about them online, but when I went to try them out I also tried Sennheiser HD 600 and greatly prefered them over the 880s.