A very good question. For just casual Internet surfing, I prefer the iPad because of the flexibility of positioning the device in many different angles depending on where I'm sitting or lounging. To me, this is where the advantage of the iPad really shines over the traditional laptop design. I think the iPad is the right choice for you, per your specific needs. That being said, eventually I may get the 11" MacBook Air, not because I need it, but because it is something that is unique from some of the other Apple products I have.
May God bless!
Ed
May God bless!
Ed