Unofficial update on Cobham/Chelton HeliSAS:
Have been waiting for the FAA to approve the 206/407 STC since about July, 2010. Latest word from Edwards is that FAA approval likely in the April, 2011 time frame.
I flew a 407 with this system installed (registered "experimental") in April, 2010 and was quite impressed. It is my understanding that the flight testing is long since complete and now the Feds are the hold up with paperwork. As far as cost, be thinking around $90,000 for the B407 (and that includes AP functions like heading hold, coupled approaches, etc.).
It is also my current understanding that Cobham has decided not to offer the HeliSAS for the R44 due to certain insurance issues.