I currently have the Sennheiser PC360s and my sound card is a Xonar Phoebus. My PC360s are good for games but I have also heard that the Q701s are good because of the larger sound stage. I have found very few comparisons between the two so my question is whether or not I will notice a major difference with some Q701s over my PC360s. Also, my sound card already has a headphone amp onboard so is it safe to assume that the Phoebus will be able to drive the Q701 to it's full potential? My usage is about 90% games and 10% music/tv.