Logitech z623 or Creative Gigaworks t3

I am in the market for a 2.1 speaker system and have narrowed down my choices to a logitech z623 or the Creative GIgaworks t3. Now my question is if the Creative is worth the price premium over the logitech's.
http://www.amazon.com/Logitech-980-000402-Speaker-System-Z623/dp/B003VAHYTG

http://www.amazon.com/Creative-GigaWorks-Multimedia-Speaker-System/dp/B001S10DDO

Now I also have a motherboard with Realtek ALC887 integrated audio chip, and my question is whether I need to get a discrete sound card and if I do get a sound card would the audio quality be noticeable If I do then I would prefer one for 50 dollars or less and it has to be PCI since my pcie x1 slots or covered be my occupied x16 slots
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More about logitech z623 creative gigaworks
  1. Haven't used those particular ones but used to have Logitech 5.1 and now Creative 5.1.
    Creative definitely sound better.
  2. what models did you use
    of the logitech and creative
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