I strongly recommend checking out Aerofly Pro. Its $139 with the expansion pack, unlimited quality downloadable scenery and planes, and free online support when purchased at www.aeroflypro.com.

I have used FMS and was impressed that it was free, but that is about all I was impressed with. I have only used RFG2 for a couple of hours and it just dosent seem realistic. If you have the opportunity, maybe someone in your club would let you check out/borrow AFP, its would be worth your time especially if you ever wanted to get into 3D (RF physics are not capable of out-of-the box 3D).