Personally, I have tested about 20 different sets of pc speakers over the last 8yrs. They all pretty much sucked especially Creative. Some that I did find ok were the higher end Midilands, and earlier Logitech models pre-z-2300's.
For the price you are going to be putting into computer speakers, you could...
$300 Athena Micro 6 - 5.1 speaker set
$150 Yamaha cheapo 5.1 receiver htr-5730
And blow away all the crap computer speakers.
Plus you get another HT system in your computer room
just my .02
Reorx