Rippling can be caused by several things.  It has more to do with the amount of tissue covering the implants, how loose the skin is and how much the implants are filled.  So the size of the implants is not really a major contributor, though of course larger implants can be more visible for a number of reasons (not just limited to rippling).

You can try to minimize rippling by placing implants beneath the muscle and/or using smaller implants and overfilling them slightly.  In patients who have problems with recurring rippling, fat injections could be a potential solution as well.

The bottom line is that rippling can occur regardless of the type of implant used or the size used, and the best thing you can do is take steps to minimize it as much as possible.  Schedule a consult with a surgeon well-versed in breast augmentation and discuss your unique situation.  He or she will be able to make recommendations based on your examine and personal characteristics.