I have not tried any of the mystical coatings, but the best wash / wax combo product - for not a crazy high price are Eagle One Wax as You Wash, followed by Eagle One Wax as You Dry OVER a good wax already there. Something like Colonite 476 or 915. (Don't waste your time with Colonite 845). I used 915 a couple months ago and it's awesome. Great luster, super huge protection so far and road junk just slides off.
I'm not saying this Eagle One soap is super aggressive OR takes the place of wax, but it sure does gently lift bugs and gunk off - on the other hand it's not aggressive at all to existing waxes. Now I doubt it really adds much if any wax, but again I don't want it stripping my wax which it doesn't and if it adds anything, then it's a bonus. The Wax as u Dry makes the car drying super fast, adds a little protection over your wax job and good to go.