The Klipsch Promedia 2.1 also has quality issues, lots of defective units. Mine died after 2 years. It was great while it lasted though, but I'd put more trust in the Logitech units. The Z623 looks good (and is more within your budget).
Seconded, I try to stay away from them as well, they are good, but personal history with them, I found they couldn't take the abuse my Z3's already have, and keep going.
OP, if you want to try a different route, you might want to look into some micro or mini systems as a second consideration, some are pretty decent for that price point, and although you do lose a sub.
But if you go into systems like pioneer, teac, or denon, they don't need one (just a thought <I used to use my old Aiwa until it finally died after 25 years, but that was because when I first got into multimedia pc's I was a really cheap b*****d, although in retrospect, for my next rig I'll buy another mini or midi system...)