I recommended that before you will choose e-book reader, You should read my
20 Useful information for Kindle buyer posting first. For the size, I think 6 inch Kindle is big enough for book reading. This is my recommendation about buying Kindle or IPad. If you are a hardcore e-book reader and you are already have laptop or tablet to use it for work on the go, you should buy IPad. If you don't have laptop, IPod or any tablet device, and also would like to works, plays game, watch movie on the go I think you should buy IPad