Well, since nobody responded to my last post, I decided to go with Exact Audio Copy. It seems to work well. After a few hiccups, I think I have it pretty much figured out. So, out of 550 - 600 CD's, I've ripped about 10 to the NAS.
This is gonna take a while.
I also picked up the Sonos Connect and Boost yesterday. I have them set up and running. So far, so good.