I am looking to upgrade my PC's headset rig, which currently consists of a Sennheiser PC160 headset http://www.amazon.com/Sennheiser-PC160-Binaural-Noise-Canceling-Microphone/dp/B0008EWRD6 headset connected to the analog ports of an Asus P6X58D-E motherboard http://www.amazon.com/ASUS-LGA-1366-Motherboard-P6X58D/dp/B003FV5XGC.
My budget is around $300 for both a new sound card/amp and a headset. My requirements are that the sound card/amp supports surround sound (I have seen Dolby Headphone and CMSS 3D Headphone mentioned). The headset must be open ear, and either have a built in mic or be modable to attach a mic to it. While I do like bass effects for explosions and gun shots, I value more audio quailty across the full range of frequencies.
Any advice or suggestions would be very appreciated. Thank you in advance.