The Onyx Boox Nova Air C e-book is a new version of the black-and-white Nova Air of last year. While the Nova Air proved to be a capable device, thanks to the versatility that comes with running Android with Google Play integration. The Nova Air C goes even further by providing a very similar experience but with the added flexibility of a color LCD overlay over the E Ink display. There are just two alternatives. First and foremost, the Nova Air C is more costly…