I second
Lake Country pads. I use 6" pads because the edges are not spinning as fast so it's safer. The pads last years if you take care of them. Also I get pads with the 5/8" arbor glued on, I don't trust velcro as I don't believe I can center them that accurately and worry they may fling off.
For the Rotary, I like to use products specifically made for the rotary, I use Malco Foam Pad Polish, Light Polish or Rejuvenator. I've tried using products that are designed more for the PC but they break down too quickly with a rotary.