I've used the combination of a [color:"red"]DMT (red) [/color] stone and a lee valley [color:"blue"] ceramic (8000 grit) [/color] for over 10 years (same stones). The red DMT (600 mesh) is carried everywhere as my multipurpose sharpener as it can handle repairing some edges as well as maintain a nice edge. The ceramic stone comes into play when I want a nice, polished, sharp edge. Both are nice as I use spit or water (when spit is unavailable or socially unacceptable) for slurry and neither requires oil.

I too have just started the belt sander sharpening technique, but I always fall back to these two stones.