In order of preference: Darkstar, DH then Custom given your 80/20 breakdown. I put the Custom last only because I have no experience with it. The SPi bindings are stiffffff, which may not be your best choice for park. I don't know if you can mount EST bindings on a regular board, so... The 390s or Unions would be a good choice. Formulas or Targas would also be an option.
Nivek, the Jibpan is a stiff board. I know K2 softened it up for either the 08/09 or the 09/10 model year, but the name really is misleading.