You don't need to spend that much on headphones, mouse and keyboard.
Amazon.com : Microsoft SideWinder X4 Keyboard : Computer Keyboards : Electronics
Amazon.com: Logitech Optical Gaming Mouse G400 with High-Precision 3600 DPI Optical Engine (910-002277): Electronics
Amazon.com : Logitech Wireless Gaming Headset G930 with 7.1 Surround Sound : Computer Headsets : Electronics
Get a gamescom 780 Headset, it has 7.1 and a mic.
Its cheap and the quality is great.