ditto on the Brand New Reader series - my son also loved the series of readers called Now I'm Reading for beginning readers - there are like 4 different levels and he liked that after you read each book, you placed a sticker in the front cover to show that you have read it (they have 4 stickers for each book to help practice)here is a link to one of the sets in Barnes and noble
http://search.barnesandnoble.com/Look-Around/Nora-Gaydos/e/9781584761679/?itm=48