I have to go with the wire that ends on a pin so I can use any old standard wall outlet/power adapter with 2 amps. I have no access to a computer at work and use the wall plug all day now. Plus you can easily get an adjustable one.
I have to clarify things here for this pin option because people might not know what you are talking about imeo... The wire connected to the GG will have a plug end or something like that which come standard on the end of universal power adapters that allow you to connect any plug on the end for use on digital cameras and video cameras.... like the one shown here...
Universal power adapter.....