MT is the standard governor in the FF kit. Van's also sells the Hartzell, but it's bigger/heavier. You may want to take a look at the PCU5000x. It's about $150 more than the MT and I am told it provides a more precise control of the prop because of 30% more oil flow.
Give Kevin at American Propellor a call. He sells all of them and has a clear preference for the PCU5000x. (800) 292-7767
I got my PCU5000X through a VAF group buy about three years ago. The group buy made the price more than competitive, and I have had no issues with the governor. It works great.