I have the Klipsch 2.1 at work. They are very nice and bassy. At home I have the Klipsch 5.1 GMX..I think they're called...(they are the ones that look all cool.) They are incrediblye clean and articulate...lean on bass. But you can chain subs with it, which is sweet. I hooked up my old sub to it and it warmed the sound right up and added all the bass I would need. I didn't think they were as good as the 2.1 at first but over time they mellowed a bit, weren't so harsh, and they're clearly more detailed and refined than the 2.1s.
I found all the Klipsch (2.1, 4.1, 5.1) to be too boomy and bloated sounding--with a seriously sucked-out mid range (all computer speakers sound sucked-out to me) Same with the Logitechs. But the Klipsch GMX is a whole new direction. For some reason (control unit, 100 watt rating, probably) they didn't get a whole lot of attention and thus can be had pretty cheap -- but these things are quite the performers, and are so clean and very loud despite it's low wattage rating. For the price they're worth a serious look, if you can find them. Easily one of the most underrated finds in this market.