I'm in the same situation. I want to wear a cheap headset but use my 5.1 on my PC. (Like on my Xbox/PlayStation) I want the voice to come out of the headset because I can barely hear my friends voices through the center channel along with the loud gun shots/sound effects. I was thinking of getting this. I think I'm going to need USB in order to be able to tell team speak or whatever application to send the voice to one specific device. Unfortunately there aren't many USB headset options.
http://www.amazon.com/Koss-Communications-Headset-Microphone-CS95-USB/dp/B00C0NWBFC
https://smile.amazon.com/gp/product/B00C0NWBFC
Been using it for a couple of years now. Cord is nice and long.
I need/want (kind of both!) this headset because anyone who works at the University has free access to Rosetta Stone, and I want to parle francais way better than I do. But you have to have a headset with a mic!