What's the smallest King that would make a good pet?

Considering a small King, looking for the smallest that is feasible as a well-behaved and good eater - any ideas appreciated!

Competitive choices - another Corn (Okeetee), a Westy Hognose, Childrens or Spotted Python, or a Leopard Rat if I could one.

Thanks!

I have always liked the look of mountain kingsnakes, and they stay a good bit smaller than most kings. As long as you get one that doesn't need lizard scented mice, they would be just as easy as any other kingsnake. check them out! http://market.kingsnake.com/index.php?cat=100