Looking at suggestions and poking around at old books, I think my heart is settling on the Zorakin / Kardien / Caddo line. A lot to do in a narrow space and from there, you can proceed in almost any number of directions.
I have a silly idea that I always wanted to do, which is to run a campaign where you use every creature in the book at least once, so I may have to plan ahead for that.
What is the best large map of Ereb Altor?
Is there a good scan of the one from the box set? The version I was able to track down was scanned folded up, it seems, so its not really usable.