If you want 3G access, get the keyboard.
I had the touch 3g preordered, and then learned through here (confirmed elsewhere) that the 3G on the touch was only to purchase books/wikipedia. The 3G on the keyboard will continue to be able to access the regular internet (and you can pick it up right now)
We got it because DD does homework on the fly (waiting for dance class, etc...) and often needs to access the teacher's website, edmodo, etc...
In either case, wifi or 3g, it's fine for checking in, but isn't that pleasurable of an internet experience because the screen is b/w. Great for the book though.
I played with it, and it isn't hard to navigate. (keyboard)