Squeze Box Question

I have avoided this subject like the plague, but this one has finally pushed me to ask the question.

But if I have a Mac/PC with Itunes or similar, a DAC like a Wavelength Brick, WHY do I need a Squeezebox or similar ???

MapMan(or anybody who wants to pitch in), I don't know what you mean by what computers may sound good ? If I am using a PC, to a good USB DAC like Benchmark or similar,the hard drive based music files, thru a program like ITunes or similar should sound, well great no ?
I understand the extra features from something like the squeezebox, but I also wonder about another compotent in the chain and the wireless part, if that will/could have any negative impact on sound ?

I also see there are more then one version of the squeezebox, and just now see it is a logitech product ? I thought it was slim devices ?

Thanks again, Wayne

So Mapman, you are saying that files retrieved from the hard drive via wireless or network cable using the SQueezebox and it's internal DAC to my preamp, MAY/COULD/WOULD sound better then a Computer via USB to something like a Benchmark or Wavelength Brick USB DAC to my pre ? Forgetting the price difference for a second, just the basic question, as we know there is quite a difference between the DACS I mentioned and a Squeezebox. I am just back do I really need the Sqeezebox or similar ? This is all new to me and I am just started thinking about this and saw this thread.
Thanks,

Wayne

Ckorody and Mapman, great text book info, just what I needed, this really clarifies.

Thanks again,

Wayne