I would definitely recommend the Logitech X-540 Speakers. They are AWESOME and at a great price. I use it for music, movies, gaming, even for my X-Box 360 which is hooked up to my monitor.
You can find it on Newegg:
Newegg.com - Logitech X-540 70 watts 5.1 Speakers
It's at $88 there, you...