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Ultimate Detailing Machine (UDM). More torque, more power, more correction ability. Only about $20 more than a brand new PC. Porter Cable has actually discontinued the 7336/7424 models.
I personally use a Festool Rotex RO150FEQ polisher.
I use the Porter Cable, but the UDM is as good, if not a little better.
Wow. The Festool is seriously hardcore. Wish I had gone for that one, but after buying the Griots and giving it away (no torque) and the Porter Cable (which I use all the time), I just couldn't see spending that much on the Festool and tossing the PC.
I also like the carpet/upholstery brushes for the Porter Cable. They work great.