Got the nail on the head there!!
You and your son are going to enjoy RC. It's a great hobby and quite rewarding in many aspects. If more kids could put there hands to good use instead of watching TV I think many would see the value in the hobby. Just my 2 cents.
My son and I spend quite a bit of time between maintanance and running, and I thank my lucky stars for RC. I look around and see all the bad stuff a kid is exposed to and all of a sudden the money spent at the LHS seems cheap!!!