I have the Intuos 5 small touch with wi-fi. During ~20 years of professional work I've been using Art Pad II, Graphire II, Intuos 3, and now Intuos 5 touch - all in smallest format, I consider working with small tablet as most efficient. I wouldn't use it for sketching/drawing/painting, but for me it's perfect size for retouching and working with PS/LR/Ai/ID.
I'd take the smallest Pro - it's a perfect, robust workhorse with a very nice feel and responsiveness. I love the touch ability, as I don't have to use my left hand to make gestures on the rMBP trackpad, so I can work even faster.