Not real big on quick detailers. Duragloss #921 leaves the surface very slick. CG Synthetic Detailer, FK 425, and Clearkote Quickshine have gotten good reviews.
Personally, I like to either rewax the car after washing, or go over it with Souveran Spray. Or even both!
Now if you're talking applicators for wax/ sealant, I like the Wolfgang or Lake Country hand polish applicators. The Polishin Pal is also nice.