I agree - St. Tropez is good, both the mousse and cream have worked well for me in the past.
For face I usually use Sally Hanson airbrush sun (the face one), it's really quick and easy to put on and gives a natural sort of glow. It CAN cause build up if you put it on too many days in a row but otherwise I really like it.
I also just reviewed one called Antidote Summer Glow (
http://www.antidoteskincare.com/)which I also liked - the smell is nice and it looks natural. There's also a checkout code at the moment for 20% off - 09BLFSH.
The gradual ones have never has as good a result for me (may also be because I forget to use it every day! Much easier to put it on once and be done with it.)