The best I've used, and continue to use, is Klasse All-in-one (in combination with Klasse Sealant, if you want to get fancy).
I've also got decent results from Meguiar's NXT Tech Wax, which is easier to come across and a little cheaper than Klasse, I think.
edit: you can get all of these on Amazon:
Klasse AIO
Klasse Sealant
Meguiar's NXT (you can most likely get this locally too)