I've got a Kobo Arc, and I love it. Very fast and responsive, lovely sharp screen, good battery life. My only grumble is that the Carbs & Cals app doesn't work on it because the screen resolution is too high (apparently they're working in it). And if you read a lot, it's great for books. I've not seen a Nexus 7 to compare it, though, so that may not be too much use