general question for the masses: Items

As we are in the process of discussing what sets to put out next, I got to wondering, what items would you , our faithful buyers,er, readers, want to see come out in sets?  What are we missing the most?  This is no guarantee that they will be see in the store anytime soon but just a discussion and possibly planning for the future...

Now, 1,2, 3  GO and start the discussion!