Orbital B-Pad Suggestion?

Hello, A few weeks ago, I purchased a Porter Cable 7336 orbital (from advise on here) and it came stock with a 6 inch PSA backing pad. I would like to purchase a 5 inch (5/16x24 threads) for smaller repairs and from looking at the 3m website, it seems there are quite a lot of options. In adition to 3m, Porter and Cable seems to have two pads: standard and contour. Last, in the archives here, there is a lot people using Power Pads (although Fiberglass Supply seems to only have them for angle sanders 5/8x11). Any recommendations? Thanks, Herb Bean