My take :
I built my (almost) 5 year old daughter an Emaxx from all of my spare parts and gave it to her for Christmas. I'm sure her younger sister will be just dying to use it too!
I had to buy all the electronics though; ebay helped out with that. All in all, I spent around $200 CAN not including all of the spare parts; hey, I already had those so they don't count!!!
I can't wait to bash our trucks around and to teach her what I can about R/C and driving!