Cellular or WiFi only?
For that price, you are going to mostly be looking at 7"
I've been impressed with the Asus memopad line for the price point. (7", have used 2) WiFi only
Not a fan of a similar spec Lenovo. (7", have used one) cellular option
Samsung Galaxy are a bit higher price, but a very good device. (9.6" cell, 10.1" wifi, have used many)
http://games.joshkirklin.com/sulium
A single player RPG featuring a branching, player driven storyline of meaningful choices and multiple endings alongside challenging active combat and intelligent AI.