I use Duragloss 501 and then the next day top it with Collinite 845. A great shine, great longevity, and good luck in trying to find something cheaper with better results.
i just got done using dodo juice supernatural hybrid. its a sealant and wax combined. two coats. to date this is the best i have used on my DD truck. it was easy to work with once the paint was cleaned and prepped. awesome shine. looks like a red pool of glass. been thru some rain and a about two washes since. beading and sheeting is off the charts!