if you were keen on going with a headphone + microphone option and your budget is a bit flexible (or if you own a powerful soundcard already) the dt990 is a good price in UK. the modmic is a good microphone option. you would however need some manner of powering them be it a good quality soundcard like the Z or an external headphone amplifier.
if you would prefer a closed headphone, the dt770 is cheaper and could be substituted. it would also be easier to drive (power) than the dt990. a xonar dg can do it barely although something a bit nicer would be suggested.
if that does not strike your fancy, the sennheiser game one is not a bad choice (based on the hd598) and would be around budget it seems.
the game zero is a closed headset and...