Have you seen this thread? While they seem to be speaking in regards to using the headphones with Dolby Headphones mode, it seems like a good starting point to learn about sound characteristics of a few headphones.
I'm just getting back into read about headphones myself, so I can't be of much help :P But I have read that the AD700's are phones people love for gaming. It seems like you are looking for more of an "immersive" sound experience, rather then the "positional" sound experience you receive with your current head phones. You rather hear better booms then people reloading from 3 houses away? I'm torn between the two styles myself right now. I think I'm going to buy a few headphones with different attributes and test them out, then sell the ones off not for me.









