I have a Kindle and just LOVE it. I have always read books but now I don't have to carry more than one with me when we travel because I have them on the Kindle. Mine has Wispernet so I can download them anywhere. I like that. I don't use the keyboard much so if I could customize one I would get the one with Wispernet and no keyboard and the ability to change the size of the font. Color is not necessary.
Hope you enjoy. I use the Kindle app on my phone and my Ipad as well as the Kindle itself.