Taking priority D, then 4 points in augmentations, may seem like it is giving you two "free" points, since your Magic only goes down to 0, not -2, and you can buy it up to 2 with 15 points of Karma. But your maximum Magic goes down the full 4 points. If you want to raise it past that rating of 2, you will have to initiate first. Like Marcus said, it is usually not worth it. Usually the sweet spot for augmented adepts is 1 or 2 points of augmentation.