Another format for arduino
I've just bought another arduino board for a project. My main complaint with arduino standard board is that it is not prototype board friendly.
There are other solutions like Modern Device BBB, but the new iDuino does include the USB adapter that may power and interface to a PC your project. And iDuino kit costs less than $18 so it seems quite cost effective. The main con is that the kit includes a resonator instead of crystal.
I haven't used it yet but it seems another development to have a look at. If you plan to buy one I think you better use Fundamental Logic website instead of eBay.