I would recommend these http://www.amazon.com/Sennheiser-MM-30i-MM30i-Headphones/dp/B004HD4L2E/ref=sr_1_3?ie=UTF8&qid=1411299181&sr=8-3&keywords=sennheiser+earbuds, excellent value, excellent brand, but no your can't get 7.1 surround sound earbuds
That is called EMI, Electro Magnetic Interference which is caused by inference given off from your computer hardware, your best bet to do is shield the cables, twist them and put some plastic sleaving on