The AKG Q701 might work for you, excellent soundstage and instrument seperation, which works very well for both music and gaming. The mids are on the warm side, but that does not seem to make rock music any worse (not sure about metal). Sound has alot of depth and texture and detail, excellent headphones for the price and I prefer them over my modded AD700s by a significant margin. Soundstage is not as wide as a stock AD700, but that is a good thing as the soundstage in a stock AD700 is TOO wide IMO. Also the Q701 have better overall bass that is not only louder, but better controlled/articulated and extends lower and sounds 'complete' and doesn't roll off like the AD700's bass. Still has less bass quantity compared to a good set of closed-back headphones, but for open headphones the bass is very good, especially the exceution of said bass. I have not heard the AD700X, so I can't compare, but in my experience the 'X's do sound better than the non-X versions (Have both the A900 and A900x. A900x is noticably better but also alot brighter).
You may also want to consider the AKG K701 and K702, I have not heard them, but many people say they sound similar/nearly the same.
Also look into the K612. Some reviews say they are comparable to the Q701 and are a warmer version. Just mind the prices, as the Q701 can usually be had for under $200 new, I would only consider the K612 if it can be had for a sizable discount compared to the Q701, but if both prices are similar I would just go for the Q701.
Edited by 0ffbeat - 7/28/14 at 12:20am