The DT770 Pro 80s are bass and treble centric cans. The mids are what's sucked out. They also are very sloppy without amping. They're easy to drive in that they get loud easily, but an amp is needed to control that bass a bit. I haven't tried them yet, but I'd seriously consider the Brainwavz HM5 and look for the velours (probably have to order them from the Fischer Audio FA-003 (same headphones).
Also, I'd look into the Custom Pro Ones which are the little brother of the DT770s (same size and all, but newer, no real need to amp aside from the Mixamp, and have a tuning systems that lets you tweak the bass... it looks VERY interesting). You'd have to order the 770 velours for it though.
I tend to recommend older headphones, but there is a lot of new stuff that could be awesome for gaming. The HM5 and COP could be ideal.