Thanks for all the responses.
We went out today to scope out a few. Ipad, Nooks and Kindle.
Hands down the Ipad was the best. But price and practicality of giving this to a 10 year old knocks it off the list. (I want one after playing with them though!!)
Still weighing all the pros and cons- but leaning towards the Nook Tablet or possibly the Nook Color. There are things that are lacking but I think it may be the best fit. I wished I liked the Kindle Fire better since I am an Amazon addict but the Nook seemed easier to navigate and set up controls to prevent DS from going crazy on it. (I felt it was easier to set up password protections on it) I really wish it had a text to speech option though- would be very handy.
DS's interest are out stepping his reading abilities. Audio books are always an option- but I really wanted a "read along" option. But besides the kindle e-readers- I do not see that option on these others.