Look into Goal Zero stuff as well. They were trailblazers in the market, but I don't know how much of the cost is their name. Also want to mention that the 2.1A chargers of the first link are what you want. A 1A charger is near worthless now a days.

Finally, if you are thinking of a separate battery, or are looking for a project, you can make your own solar charger kit pretty easy and it'll do much more at the expense of weight.

My favorite how-to video is removed, but look up solarburrito on YouTube. He's got some okay tours around some stuff he's built.