Imho, P1 - The King of the Trollhaunt Warrens has the most versatile poster map: It shows a town wall.The only one that might be somewhat useful is Keep on the Shadowfell, which you can download for free on the WotC website to check the maps out.
The most versatile poster maps in H1 - KotS are reprints from the Fantastic Locations series. So, the module's only useful if you don't already have those.