meguiars Gold class is the best wax period. I detailed cars for a whole year and I've never got a complaint. If your paint is rough, get the clay bar system first. Then use some kind of scratch off to get rid of the scratches. I would then use the 3 step system, but use meguiars gold class to finish it off for the waxing part. Waxing frequently will give you more protection from all the s*** that's in the air. Between waxes, use Meguiars quik detailer or if it's just dusty or has pollen, use a california duster.
4 things you should have in your car:
100% terry cloth towels
Meguiars Quik Detailer
California Blade (for rainy days, and if you dont' have a garage)
Invisible Glass by Stoner