In the process of learning about 2.4GHZ Hobby radios for use with my RailBoss R/C system for large scale trains, I discovered R/C helicopters. I have always wanted to fly R/C planes, but the cost and learning curve has always held me back.
Now, they have Ultra-Micro R/C helicopters that you can fly indoors. There are several different versions that allow you to learn to fly in a controlled manner. And even though you will crash many times, the little critters are very durable. They only weigh 1.o ounces, with Li-Po battery installed. They are easy to fly and a bunch of fun. You can get started for a little over $100.
I got a Blade mcx for Christmas. It is a coaxial helicopter, the easiest to fly. I just received my new Blade msr, a fixed pitch helicopter with tail rotor motor. It has much faster response and is quite a handful so far. Anytime I need a break from G-Scale Graphics, I now just pick up the transmitter (the same Spektrum DX5e I use for the trains), and fly a heli !
If you are interested in this, just do a search for Blade mcx, or Blade msr. You will find an abundance of information and You Tube videos.