In a sense, it's the same as buying any speakers. There are quality computer speakers out there, including by Klipsch, but you might not like their particular sound. You have to find the speakers YOU like best.
I would check out customer reviews on Amazon.com, as well as what PC Magazine has liked at
www.pcmag.com. Make a list of the main contenders. Then see if you can go to some good computer stores, like CompUSA or Best Buy or whatever you have where you live. Then listen to as many as you can. If you find a brand you particularly like, chances are their other speakers will have a similar sound.