You can get the 2.1 Klipsch usually cheap on eBay. I've got a $600 audio system and the 2.1 still sound better than that.
Here's what THX certified means (which these speakers are)
What Does being THX®-Certified Mean?
Being THX®-certified means that "insert name of speaker set here" has passed the most stringent and rigorous audio quality and performance test set by THX, the audio experts in the movie industry.
WHAT IS THX CERTIFICATION?
Certified THX products must meet an exclusive set of performance standards established by THX. These THX performance standards were originally developed in response to George Lucas' personal desire to insure that the original Star Wars soundtracks, heard in the cinema, matched those created on the sound stage. Later, these standards were extended to encompass Home Theater systems and recently adapted to the specialized needs of multi-channel surround reproduction from movies and games, on DVD, played back on a PC-based multimedia system. All multimedia products seeking THX Certification must meet these rigorous performance requirements and quality standards before they can carry the THX logo which is your guarantee that the THX certified Multimedia product will give you performance and reliability, second-to-none, for years to come. These performance standards cover all aspects of the product including power handling, frequency response, dispersion characteristics and more.