I really like General de Brigade. It has a good balance between realistic portrayal of Napoleonic warfare and speed of play.
I have played La Salle, Shako and Black Powder and I think these games while good for those who like fast play. However, IMHO they sacrifice to much realism for faster and shorter length games.
Also, GdeB has its own Blog site where there is much discussion and friendly banter about the use of GdeB. Also the creator of GdeB, David Brown, administers the site and offers clarification on the rules.