I use 3 QD's, each has its own advantages. Spray and Wipe is good for cleaning ability, but totally useless for shine enhancement. CG's pink DS is cheap, slick, contains some sort of wax, somewhat glossy and has decent cleaning abilities. An overall good mix, plus the stuff is dirt cheap (I use 20 bucks worth a month, if I'm busy).
For my own car, as well as cars with owners who care, I use PB's S+G. It can streak, it has nearly nonexistant cleaning abilities, and it's extension of wax protection is dubious, but man does it shine. Not a good all around product by any extension, but it does what it does better than anything else I've used.