Minch,
I like to use two 2400 Ma 5 cell SCR Ni Cad packs from Hangtime Hobbies and 2 switches and voltage regulators from Fromeco.
The SCR Ni Cads have a very low internal impedance, around 4.5 mOhms. This means they will dump energy very fast, in case you are using lots of digital servos, and they will take a fast charge.
I don't use any kind of optical isolators or powerboxes. It like to keep it simple. Use the "KISS" principle.

In well over 600 flights, I have never lost an airplane or had any battery related problems.

Harley Condra
BVM REP
JetCat REP