DAS6 Pro is 850w, and the DAS6 is 500w. Overall finish from both is identical, just the 850w machine gives you the ability to be able to get through it a little quicker i guess. I am all about lazy so the 850w is my pick hahaha

But either or is a great step up and choice, and at least you can correct the paint properly. Just ensure you clay prior and finish off with a good wax or synthetic wax if you choose.