Thanks for all the helpful replies. To sum it up, is it still OK to go with Nicads? From what I've read, the Lipo and niMH give you longer flight times and last longer than Nicads. I just feel that I'm too inexperienced to take on the new types just yet. If I get the correct torque servos for  4.8V, nicads for the TX and RX, will I be OK flying the RV 4 1/4 scale aircraft?