Reflex looks so awesome but you need a fast computer to run it.
Realflight is good but IMO is overpriced.
I really like AeroFly Pro, it's not that expensive and the simulation and physics are great as well as the graphics (not as good as Reflex but a lot much better than RF G2).

In conclusion as fpdesignco said, AeroFly Pro is the way to go.

My two cents.


P.S. I disagree with stanng, I do not think the Flight sims are a waste of time, they are tools to improve your skills.