Simple and great-sounding describes this recommended desktop system.
Audioengine A2+ Powered Speakers ($249)
The Audioengine A2+ Powered Speakers are stone-cold classics. They come with everything you need including a USB cable to connect your computer to the master A2 (one speaker has all the brains), and speaker wire to connect the two A2’s together (see the manual for more info). Available in Satin Black, Hi-Gloss Red (my favorite), and Hi-Gloss White.