I'm fairly new to the (good quality) headphone world and I'm interested in purchasing a new pair headphones to use with my pc. My music taste is mostly electronic (although I'm not a basshead) but I also enjoy my fair share of acoustic/rock and live performances. I also require a good sound stage as I play fps games both competitively and non-competitively (this is a deal breaker for me). My source is iTunes playing mostly 320 (although I am building a FLAC library as I speak) through a fiio e7 (as a DAC and amp) and I may purchase an e9 in the future to pair it with if necessary. There are three sets of headphones I have been drawn to in my research so far; grado sr80i, audio technica ATH M50 and audio technica AD700. I would like to stick to a budget of £150 but I can stretch to £200 if I feel it's worth the extra investment. At the moment I am using audio technica ATH pro-5v after a recommendation from a friend and although they are still better than the logitech rubbish I was using before hand, after using another friend's HD650 with a good amp and DAC I felt I had somewhat cheated myself by not spending the time to research properly and make an informed decision. Any advice will be very warmly welcomed and thank you to anyone in advance who provides some usual information for me to use.