I have been using the Dunlop Ultex Jazz III JP's for about 3 years now, they are just a little larger than the normal Jazz III. They feel very smooth and the tip is just great. It is sculpted just a little, and it glides of the strings perfectly, it enhanced my playing in a great way, there is just the perfect amount of pick for me to hold onto and have a speedy tip. The grip is perfect, it is not too rough, and not too 'clean', you do not notice it much at all you just automatically hold on.
Maybe my quest for the ONE pick is over..