Logitech z623 or Creative Gigaworks t3

Computer LVR

Honorable
May 11, 2012
72
0
10,660
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