The most likely choice from AkiP's POV (whatever that means..) would be A1, I think. New group => ought to start with the basics that built up this 'empire'.
For me, I'd want to see them go with A3. Just 'cuz it's an old enough stage to be considered part of AKB's history, but recent enough that people still know about it (Bird still rocks the request hour charts!).