iMAC with Yosemite and best NAS drives with SONOS

I have just bought a new iMAC with iOS Yosemite. I need to find the best and reasonably priced NAS drive solution to link between my iMAC and SONOS system via a wireless NAS, swell as normal home/family backups and sharing of music,docs, photos etc. Am seeing lots of issues in forums but no recommended solutions. I am not technical so will need easy to install and set up. Anyone able to advise?