UPDATE December 4th 2010, lipo's have come a very long way, they gotten cheaper and better so i have been using lipo's mostly.
I still feel A123's are the best safety wise however.
Just wanted to add that I have gotten back into helicopter and purchased a blade 400 used on HF and love it, I have 280 flights and still having fun with it.
Set up:
Stock blade 400 with stock motor.
Castle Creations 25a Esc, set to Gov mode 2250 HS
HS 56's servos
Futaba 240 Gyro with Hyperion Dig. tail servo
Carbon main blades
using Billowy 40 to 50 C packs 2250's 3S
For unlimited power no bog ever.
Also Over the summer my Club decided to have a Half A pylon race, some of the members still owned the original Ace GLH's but one of the members redesign them and made them for electric power using cheap hobby king motors and esc's and battery's. Called these POD's ( Paulding one Design) Everyone used the same motors, (they all slightly different KV) but close as you could get. We all used whatever esc/battery's and servos but most use the cheap 9G HK ones.
This was a lot of fun and hope to have another race next year, i took 3rd out of 9 pilots, the 2 glow guys didn't have a chance they could not keep there engines running ( TD051's)
I have added pictures of my blade 400, the GLH I used for a practice plane and the POD I raced, and also i owned a AJ slick for about a year, it was a really great flying plane I used 2200 3S lipo's in it also to keep the weight down it did everything nice in the
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