rayclag, as you use the word actuator I presume you mean a limited-motion device. In addition to the basic motor types mentioned there are relay type rotary actuators eg Laws relay and toroidally wound actuators. It depends on your application - whether you simply want to swing between two end stops or whether (at the other extreme) you want fast-acting accurate continous angular control.
There are also other rotary devices that you may consider, eg the switched-reluctance motor (capable of giving fixed step motion), these are rugged and simple but not generally available off-the-shelf.
Stepper motors obviously have fixed steps and can be used open loop, so the drive requirements are simple and they have no accumulated position error, they have reasonable holding torque but won't give you continous positioning.
Brushless dc motors give continuous positioning that can have very low torque ripple, but you will need a controller and a position sensor.
Brushed motors are not going to be satisfactory at anything like 150degC.
In addition, the high temperature will almost certainly require class 200 copper wire, eg Kapton (polyimide), and avoid neodymium iron boron magnets.