I'm using a Plantronics headset w/mic that uses 3.5 male jack.

I have the mic cable plugged into the "mic" port on the back of the computer and the other cable on the headset I ran up to my desk. I can either listen threw the speakers or I can plug the cable into my speakers so I can listen threw the headset and cuts off the speakers.

I want to purchase a new USB headset like the following. I'm assuming USB would give me better performance. http://tinyurl.com/37zv3al

How can I set it up so I can still either listen threw the the speakers or the headset.