Hi, use the free 7.1 surround simulator called Razer Surround from the Razer website. It's good enough to make your HD202 great for gaming. I used that setup for Tomb Raider 2013, and it's excellent. But if you want punching bass and better surround, go with HD202 + Asus Xonar U3.
Another thing that you should consider when buying the HD202 is the size of your ears. If your ears are wide, the HD202 is not for you.