Someone asked me what my schedule is for doing the Top 20s. The schedule parallels the book: as I complete a team for the book, I do a Top 20 list. It helps me make sure that I've got the grades lined up semi-correctly.
As for the order I do the teams, that depends. I always do the Royals, Twins, and Braves as the first three teams. Don't know why, but I've been doing it that way for ten years. After that I try to alternate leagues and divisions, usually I plot out two or three teams ahead so that I can get my subconcious working on the issue. Here is the current schedule of teams: