oh man such misinformation here it's not even funny....
The BEST wax/sealant is completely subjective and can be biased, baised on color of car, type of paint, condition of paint, etc...
Autopia - Autopia Home is your friend in this case
EDIT: I personally like the Klasse twins for ease of use and longevity of shine/protection...another good top coat would be Collinite 845, Pinnacle Souveran (not liquid, strictly paste) for dark colors, Zainos Bros, etc...