Here's the current list of suggestions and their status:

Rubber Boa-Too hard to get and not very pretty
Rosy Boa-Does not fit the size specifications
Blindsnake-Way too small, not that cool, and not CB
Male BP-Not my type and has the usual BP problems
KSB-The top suggestion
Milksnake-Ditto Rosy Boa
Children's Python-Kind of thin but still has a chance
Caulker Cay or Sabogae-Unaffordable
Scarlet Kingsnake-Not a CB species
Anthill Python-Unaffordable
African House Snake-Kind of thin but otherwise acceptable

The ones in red mean that they have a chance of being my next snake.