I have tried almost every RC flightsim both Freeware and payware and there are HEAPS of them out there !!!
LikeG2 - great software, a must have in your software collection. Commercial and cost about $120.00 US, Good Tx interface.
FMS - Good software, free, a great place to start with sim software. Build/buy tx interface
Aerofly - I don't have but seems well recommended
RC Plane Master is without a doubt the best when it comes to
Value for Money at under $50.00 US and is packed with features that you would normally pay as much as $150,00 US or more for !!!! It has everything that caters for the newbie right through to the most experienced flyer !!
RC Plane Master is about the only RC Simulator that you can download a DEMO Version to
Try before you buy
http://www.realitycraft.com/