Dynamic Web Enterprises makes and sell the RFFS and actuators (
http://www.smallrc.com/ ). Bob Selman sells the Kenway motor/gearbox assemblies and larger actuators (
http://users.joplin.com/~bselman/ ).
The RFFS is less than 2 grams, the actuators are 1 to 2 grams each, and LiPoly batteries are 3.5 grams, and the KP-00 or Kenway motors are about 5 to 6 grams. The radio has a built in ESC, so thats the whole package. Your whole flight pack will be just about the same weight as the ballast you pulled out.