Hey all, I need to know the difference between AirPort Extreme 2011 refurbished on the apple store, and airport express 2013 new. I figured I'd come here since you people know more about this stuff than me. I'm not considering any alternatives, so only compare these 2 please. How do the signal ranges compare? Does the 2011 model have airplay? Can both do wireless backup to external USB drive, etc. Basically which one should I buy?