[DonRotolo]

We generally allocate about 15-20 pounds for electronics, minus motors and battery. Here are the items you really need, you can find weights for those I didn't estimate:

cRio + modules
Power Distribution Board
Main Breaker
Victor/Jaguar speed controllers
Spike Relays (maybe)
Radio
Digital sidecar
Wiring (up to 5 lbs! Copper is heavy)

Good luck!