I have used AIO then gone straight to the NXT several times on a black car first, and now on my dark metallic blue car and the results are always quite stunning. You could always use a PB SSR before the AIO if need be, and then you'd have yourself a pretty complete system with the NXT taking care of cleaning the surface of any minor contaminants.
I've also gone from PB SSR2.5 (polishing pad) straight to NXT by hand with no problems either.