Hi H4rdy,
I don't use sonos, however I have just finished ripping 900+ CD's using dBpoweramp. My source is an iMac outputting into my Hi-Fi using a Firestone Dac. As for Dbpoweramp, I have tried others, EAC, iTunes and the ripper included with J.River. I settled for Db due to its extra functions, the latest version has better artwork retrieval. I use AIFF for my playback copy, which both J.River and iTunes can handle. Storage is cheap, so I don't see the need to compress my playback copy. My Archive copy is in Flac due to its superior tagging support. Db has a great music converter included so creating another copy in almost any format from the Archive is very easy.Db also has a multi encoder allowing one to create more than one copy of a CD at the same time, in multiple formats. Great for me as I have two external drives.
Cheers Craig