Be careful how you choose the screen size. 7" is good only if you plan to hold the device in your hands all the time, even when you watch videos. If you watch e.g. movies that typically last more than an hour, you would want to free your arms and put the device somewhere flat (e.g. on a desk) that is 2-3 feet away. Then you'll find out that 7" is too small. As someone who has both 7" and 10" devices, I think 10" is a better choice.