I got it now, the expander pro is regulated to the RX only, not the servos.. The Power System is regulated to the servos if you are using lipo's...

I'm going with the power expander pro, it's a $100.00 bucks cheaper and I am not using lipo's, just 6.0V Ni-cads.. I know the batteries I'm using are old school, but they never failed me and I can leave them on trickle so they are ready to fly when i am...

Gerry, Thanks for the offer.
I got all that stuff from my LHS, I try to buy all my stuff from them to make sure I have a LHS to go to...