Any idea what the weight savings on the shorter version would be? If it's the same height, almost the same weight, and just a little smaller in diameter I'm not sure if being a little more coal-efficient for smaller cooks is enough to justify a 19.5" over a 23" (I'm also guessing the prices won't be too much different).
I do like the idea of trying for a modular design and letting the user decide, but since the legs are more securely fastened than in the cheaper models I don't know if that's feasible (kind of the same as a supporting two 19.5" models from Dennis' standpoint). Maybe make the shorter version but also sell a little pedestal for it with matching tile? Or one made from teak?