Can I just jump in and recommend a proper pair of headphones, such as the Audio Technica AD ATH700/900, Beyerdynamic DT770/880/990, Denon D1000 etc and a clip on/ desk mic? You'll get better value for money, much better sound, durability and flexibility. Just my 2 cents.
I'll just add that 5.1/ 7.1 is a gimmick in my humble opinion.