I currently use Bose companion 2 series 2 speakers which are hooked up to my 360 using the red and white audio cables (my 360 is hooked up to a monitor).
The problem is, the speakers have the ability to connect to only one thing at a time, meaning I have to connect my headphones to the back of my computer to get sound from it or completely rewire my speakers.
I am looking to buy speakers that are good for gaming, can connect at least to a PC and a 360 at the same time (using red & white cables for 360) and dont cost too much more than $150. Any suggests would be very helpful.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic