Just to add some variety to your life, you could also consider the Lansky system (I would suggest the kit with diamond hones). You can also put on convex edge on a blade using nothing more than an old mouse pad sitting on a hard surface, with various grits of wet-dry sandpaper on top. Unlike most sharpening, where you draw the edge of the blade onto the stone or whatever, with this way of doing things you pull the edge of the blade across the sandpaper. You don't have to worry much about maintaining a proper angle, the flex in the mousepad pretty much takes care of that for you.

I carry one of the pencil sized diamond coated rods in my Leatherman belt pouch, with that I can put a usable edge on a blade in seconds...