Well what you have picked there will sound nice. I have a logitech 5.1 surround as well, and it is very nice. Lets see if I can find the link for it...
nope, I can't find the link to it. They must have quit selling my model. Anyway, it's THX certified, and sounds awesome! I think it is the predecessor of the Z-5500. Very similar setup, just not quite as many watts and a different controller.
EDIT: Here's a pic from the "my workstation gallery" of...my workstation
Here you can see what I mean