It depends on the terrain and your riding style. Most of the kickbacks I've worked with are Bendix types from the 1960s. The basic principle is the same though as to setting your gearing up. If you're going to be going up anything more than very mild climbs, then I'd go with a larger rear cog with a normal-high hub. This is especially true if you're going to be coasting downhill. If you're just on flat terrain or you want to be able to "push" downhill too, then normal-high stock is often pretty good. The idea is just what you said-- pull the high down and make the normal a "climber". Bendix addressed this concern by making a couple different kickback hubs: "normal-high" and "low-normal". The user at home can tweak using the cog size as needed.