Creative Inspire is the best out of the three listed, SBS is their budget series. Microlab is not a known speaker manufacturer; therefore I don't trust them to have high quality systems.
Altec lansing is another very reputed audio device manufacturer, Logitech also has pretty good PC speaker systems. You cant really choose a good speaker system by brand, best is to listen and choose. But I know this is very difficult in SL shops, as most of them don't put speaker systems on display. The next alternative is read some professional reviews. Most good speaker systems have reviews, first go pick out the models that are in your budget and then read some online reviews.