need help choosin a speaker system

[completeandutterNEWB]

i need to kno which speaker system i should get
Creative Labs MegaWorks THX 5.1 550 Speaker - RETAIL (http://www.newegg.com/app/ViewProduct.asp?description=36-116-118)
or
Logitech's THX certified Z560 4.1 surround sound system Retail (http://www.newegg.com/app/ViewProduct.asp?description=36-121-101)

i'm leaning toward the Creative ones cus they hav 500W and they're 5.1 but the logitech isn't bad and i can afford either one so im just asking to see if there's a quality issue with either one (i.e. do the amp's die or are the speakers bad or sumthin like that)
suggestions would be great thanks:D

[completeandutterNEWB]

this is the second copy of the same thread i dont kno why it came up

[not important]

I've heard real good things about the Logitechs Your best bet is to listen to both and make your decision from what you hear.