I'm a RealFlight G2 fan. I shopped around and Tower had the best deal. They have (had?) a $20 off special and threw in Add-on #1. To sweeten the deal they allowed me to make payments with NO interest! Check out their 'Easy Pay' 3 month plan. I'm not sure if they still have these offers...
I was going to go for FMS but I didn't feel comfortable making a cable to plug my transmitter into; what if I fried my TX? RealFlight G2 has a TX (if you don't have one already) and the graphics, response time and features are amazing. I love it. The 3 month pay plan took some of the sting out of the $200 price. There is another option; RealFlight G2 Lite is only $129, also at Tower but I don't think you get the $20 off or the 3 month.
One word of advice though, you need to have a decent PC. Check out the requirements before you buy.
www.realflight.com