I was going to buy some Meg's #80 for paint correction, but it looks like Megs #83 would be the better choice since I have a DA. It looks like I shouldn't bother buying the #80 if I buy the #83. Would this be correct? I'd want to use it on the light cutting pad right? Also, is there any real reason to buy something like Optimum Car Wash over Meg's NXT? I'm about to place a large AutoGeek order (for me anyway, probably a small order for some of y'all) and I'm trying to save some money if I can.