A good speaker system for PCs is the Harman Kardon Soundsticks III 2.1 Channel Multimedia Speaker system with Subwoofer. This speaker system comes with two speakers and a subwoofer.
The Harman Kardon Soundsticks III has a unique and stylish design which gives it an attractive look and enhances audio performance. The exterior of the speakers and subwoofers is made of a transparent durable polycarbonate material. The speakers are angle adjustable to direct sound and take up very little desk space. The speakers provide a balanced sound and the system is compatible with PCs, or any system with a stereo mini-Jack output.