One of the first things I do when I buy another iOS device is get some more cables. In my household. We have two iPads, three iPhones, and a couple of iPod nanos, so we can always use a cable. And for under $20, rather than buying the Apple one, the Dexim Visible Green is a better alternative.
Dexim's cable is rugged and has a tough coating, whereas Apple seems more interested in making their cables thin and light. I want my cable to be reliable and stand up to the constant plugging and unplugging that is to be expected. My Apple cables tend to fray around the connector.
Moreover, the Dexim cables have a built-in electroluminescent light strip that shows the current flowing while charging. They offer cables with different color lights including green, purple and blue. It's novel, and useful as you can know when the device is charged as the light turns off! Plus, it's just plain cool.