RE: NMH batts.
Out of all the batteries out there, NiMi would be my last choice !!!! I've seen too many false peaks and inconsistant Mah recharge amounts... Never got bit, but got rid of them before the they had a chance. IMHO, Nicad's have hauled the hobby for alot of years, and it's one of those " If it ain't broke don't fix it " . In the modern technolgy Batt's for reciever app's , I would go with the A123's... In either case you don't have regulators, power boards, ect..... All of which just adds failure points. Battery - Switch - Reciever... Don't get much simpler than that.
Danno