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I recently bought the Klipsch Promedia 2.1 system because I already had the Logitech z623 for my television in the family room. The differences in both of them are pretty clear. The Logitech sounds more mid ranged which is also why the bass probably sounds a lot more. While the Klipsch in my opinion were better, it was because they hit all three of the sound spectrum highs, mids, and lows. Still at the same time it had strong bass comparable to the Logitech z623. Overall they both are really good computer speaker systems but if I were you I would choose the Klipsch Promedia 2.1 System for overall better sound signature.
BTW... If you do get the Klipsch Promedias and you notice the back plate getting pretty hot, I am pretty sure your still fine just do not blast your speakers on full volume for hours on end.
What's great about it: Highs, Mids, and Lows
What's not so great: It tends to get hot on the backplate