Are there other sources of suggested sets?
One great resource is Dominion Deck Builder, a website that allows users to design and save kingdoms. They can be voted on, discussed, etc.

This is also a frequently-discussed topic at the Dominion Strategy Forum. Here are a few threads that each list several Kingdom setups that people have suggested, and in the latter 2 threads, voted on:

http://forum.dominionstrategy.com/index.php?topic=11251.0

http://forum.dominionstrategy.com/index.php?topic=6785.0 (Older, so does not contain Dark Ages or Guilds)

http://forum.dominionstrategy.com/index.php?topic=11100