You really must add the Reality Craft simulator. http://www.realitycraft.com/sims.php

This is quite advanced. It has realistic crashes where the plane or heli breaks up into pieces that bounce around, good crash detection,
and it is the most difficult to fly I have tried. This is the most realistic I have been able to try.
(some other demos don't really let me try or only let me try with the keyboard)

With helicopters, the helicopter will roll or pitch off to some arbitrary direction just like in real life, and it needs constant correction.

The plane I tried yawed off to the right as it was taking off, hit a pylon and knocked it over. Just like in real life. This is how I trashed my first Cessna trainer.
In other sims, taking off is very easy, like the plane would be on rails.

I feel I will get good, applicable experience using this sim.

Reality Craft also has some RC racing and dogfight games that you can download for free and compete with other people in the internet.
http://www.realitycraft.com/games.php

And the price is about 81 EUR or 116 USD. (59,99 £) including a USB controller. (46.99 £ without)

Crikey, I only have 8 flights left on my demo.