First of all, the title of your thread makes no sense whatsoever.
Second, your question is confusing. What part of your proposed configuration are you concerned about working, and in what way?
Third, you're willing to drop $350 on a qualty headunit, but you want to use a cheap-*** $20 USB sound device? In my mind that makes no sense whatsoever.
You're going to need a way to get the audio tot he headunit. That headunit doesn't have a native AUX input, so you're going to have to hack into the AINET to get it to work, but it can be done. I believe that aux adapters can be purchased, as well.