I'm partial to Swans speakers. I'm not sure what you like in sound (some people like bright sounds, sound people like tremendous bass), but Swans makes very "accurate" speakers. They're very clear and crisp, and the sound is just right. They are kind of expensive (~$190 for the computer multimedia speakers, newegg carries them: http://www.newegg.com/Product/Produc...2E16836136102)
, but I think they are so accurate you'll need to buy a $500 sound card to have enough snuff to match the speakers. No subwoofer you say? You don't need one with these, they've got plenty of depth (though it won't have that subwoofer punch if thats what you're looking for, but you can buy a sub seperately if you want one real bad with a set of these). Real wood case too.
I don't like Klipsch because they tend to be fragile, and have quality control issues.
What are you doing with these speakers anway? Listening to music (what kind? rock, classical, R&B, jazz?), or playing games? For games I think Logitech is better, for that surround sound experience and you don't need super high fidelity speakers for that. For very complex music like classical or jazz the Swans will blow you away. For heavy bass and high treble like Rock, R&B, Pop, Rap etc, can try Klipsch, or Bose, or JBL. I recommend going to a brick and mortar store, take like a DAT/CD/MP3 player with you with songs you listen to (try to rip MP3s with highest bitrate possible so you don't run into the "oh these speakers sound crappy" but in actuallity it's your MP3's that sound crappy. DAT and CD you don't run into that issue, though almost no one uses DAT anymore which is a pity), and test out the speakers.