Going by what you have listed as your usage, an iPad would most definitely suffice. There are obvious benefits to an iPad; battery life, weight, size, battery life. Of course you don't have to spend 2k to get into a Macbook, you can pick up a MBA for under 1k, check out the refurbished section of the Apple store.
You can always try out an iPad, if it doesn't work out after a few months, just sell it.
"You think that's air you're breathing?"