~$190 (score: 9/10)
People have mentioned the physics model in Reflex seems better than RFG2; however I have not tested this. However, Reflex does not include a USB controller (only USB interface for a regular transmitter) and does not support network play.
The previous version of Reflex (version 4)is not as pretty as RFG2, but has a good reputation for accurate heli flying characteristics. However, the latest XTR version has now been released and it looks fantastic - much nicer than RFG2, and it has improved the physics model even more.
Futher information available from www.reflex-sim.de.