Don't cheap out on the esc too much! This can be more expensive since buying a cheap one will only force you to buy another esc. My original Corona 120 setup had the Multiplex 480-4d motor (works fine with fixed-pitch) with the MultiPlex 35 esc. The MultiPlex esc I had did not have a soft voltage cutoff, which means when your battery pack is low enough to reach cutoff voltage, the esc completely cuts power to the motor- with no autorotation, the drag of the motor brakes the rotors to a complete halt, no matter if you're hovering 12 inches up or 12 feet up. This is VERY frustrating. You have to completely close your throttle to rearm the esc before you can power the motor again. A SmartBEC can do this soft cutoff function for you, but this just adds to your setup costs. Stay away from any esc with no soft cutoff for use in a heli unless you use a separate BEC that will gradually slow your motor down once you reach cutoff and then disable the cutoff function in the esc.

The CastleCreations 35 has soft cutoff. It's a widely used controller for good reasons. Kontronik Jazz controllers are also very good- I have used both with good results. I cannot comment on any others.

cheers