When considering AP helicopters keep in mind the following:
Parts availability and cost
reputation of company
how long this particular design has been in use. This is REALLY important as some companies offer a AP heli one year just to discontinue it the next.
My vote goes for the following......
Check out Bergen Helicopters.http://www.bergenrc.com
There dedicated camera ships are the Observer helicopters. You can get this in electric, gasser (single engine, OR TWIN), Turbine.
CHRIS Bergen offers to build it (for a fee of course) and will incorporate autopilots, electronics, etc and have it truly ready to fly when you receive it.
The best customer support, ALWAYS parts on hand, and always willing to talk on the phone.