One thing the Arduino Nano lacks is a 2.1mm power socket for supply voltages higher than 5v. The standard Nano breakout board has that 2.1mm socket, but doesn’t offer any additional current availability – 5 volts still comes from the small analogue regulator on the back of the Nano PCB.
But I’ve found a Nano compatible breakout board complete with a 2A switched mode power regulator. It’s actually designed for the Arduino Micro (a breadboard friendly Leonardo), but the Micro and the Nano are largely pin compatible.

New arduino Nano v3.0 I/O expansion board micro sensor shield Uno R3 leonardo
http://r.ebay.com/udA6H8

Arduino Micro ATmega32u4 5V 16MHZ 100% compatible Arduino Mirco Replace pro mini
http://r.ebay.com/BSfvPy

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