I've owned a Klipsch Promedia 2.1 for over a year now, and I've recently retired them. They're probably my favorite Computer 2.1 speakers out there for the money, though I hear rave reviews about the Swan M10 as well. (I'm also curious as to how the Razer Mako's sound)
I purchased mine used on ebay for $80 shipped, and I was lucky enough where mine was a completely working unit, with no flaws as well.
I also replaced my speaker wires with custom made 18guage wires, also purchased on ebay (though now I realize I could've made something a lot better and cheaper). Contrary to what people said about lacking mids and what not, I don't believe the cables made that much of an improvement: it definitely won't lift veils. IMO a star-quad cable about 6-8feet in length terminated in a mono plug (i.e. Neutrik/Canare F11/Switchcraft) would be a much much much better alternative than the more expensive monster cable upgrade.
The bass is beautiful on this machine, and the built in headphone amp is definitely a bonus.
In terms of purchasing on ebay, it's definitely YMMV. I've seen 90% of these as used/refurbished on ebay, not to mention that Klipsch Promedias are known for reliability issues (blown fuses, DIN plugs/cable failing).
Again, the one I purchased has ZERO problems whatsoever. If anything, you can pair your own set of speakers to it by connecting them via the speaker posts on the back of the subwoofer.
In terms of spending full retail, I'd suggest saving your money for something more substantial such as Audio Engines. But if you can get one that is gauranteed not to be faulty at below 100, then go for it!
Hope this helps
Edit:
I've seen these @ Best Buys more than not.