There's a lot of threads knocking around on this forum on the pro's and con's of Realflight G2 compared to other available flight sims. You might want to check out Aerofly Pro as an alternative. The majority of opinions I have read here are that Aerofly presents a more realistic simulator than G2. It also costs less $$$$. There are a number of websites around too that offer models to fly in Aerofly, one of the criticisms of G2 i have seen is that the planes are limited to Hangar 9 planes (but do not know if this is fact having never owned it). Check out the link below anyway:

http://www.rcuniverse.com/forum/Aero...2075053/tm.htm

There is a new version of Realflight (G3) in the pipework too but not sure of a release date or whats new here.