I finished installing the Esky Bell Hiller head. It works great. These are parts I needed from heli-fever.com:

EK1-0228 Center hub set............$6.75
EK1-0229 Rotor head set............$6.75
EK1-0231 Paddle control frame....$4.38
EK1-0234 Pitch control link.........$3.13

Total......................................$21.01

I also picked up a couple sets of their $5 wooden beta blades and I do like them.
I find the performance with this BH upgrade is much better. My BCP is more stable and a lot easier to fly and keep under control.