Alexaris,
I think you are good (for the dark green sunfire and silver Audi A4 was it?) I will also recommend some #82 Swirl Free Polish. DACP is pretty strong, and sometimes on certain finishes it will leave behind a fine haze, #82 should remove that. Also a nice small bottle of Dawn original blue (12 ounces or so.) This is to wash the car after you clay and polish it before starting Zaino. Thats about it, wash car with regular car wash soap, clay, polish, Dawn wash, Z away.
Good luck!
Jason
PS. My Home Depot has it, BUT only available in 1 and 1/2 inch or 2 inch widths.