I'm using a set of Athena AS-B1's on my PC with great results. Was using a set of Logitech Z-2300's, and while I liked them the Athena's have much more accurate and full sound. Paired with the Pioneer sub vraxoin mentioned would be a great setup IMO.
HD-DVD: 55 / Blu-ray: 97
newest: Brotherhood of the Wolf / Kingsmen, How to Train your Dragon
AVR: Marantz SR6006
F/C/R: Polk RTi A9's / CSi A6 / Speakercraft AIMWIDE 3 / Sub: SVS PB12-NSD
SonyXBR-75X940D Samsung BD-P2550, Toshiba HD-A30, Nvidia Shield TV (2015), Xbox360 Elite, PS3, WDTV Live