X-Plane flight simulator used to have some pretty good rotary aircraft. It has been awhile (2000?) since I used it, but it was better than MS at that time IMO. The MS flight simulator was pretty good, although you needed to have a good frame rate and rudder pedals when trying to hover. I think Apache Longbow (or Longbow2?) (which I have copy but never played much) was supposed to have realistic flight characteristics, but I found the game focus was on ordinance not flying.
Also, RealFlight G3 is a simulator for RC helicopters (it has many planes too) that includes realistic torque and ground effects. The cost is a bit steeper at $200, but that includes a Futaba controller. It's pretty cool and I've had a blast with it!
Regards,
Malta