stepper motor or else ?

Folks,

I have a problem to solve that seems to be an average robotics type of an issue (but I am a newbie)

In the robotics project I am involved in, there is a platform that needs to be rotated to a certain angle and it needs to stay there. The thing that makes it a little different are some of the requirements:

- the amount of torque needed is something like 60 Nm to make it turn.

- while it has reached a new position, it needs to stay at the same location even though there is some small torque (say 6 Nm) to push it back to the initial position. There is no need for rapid turns.

- the device needs to be initially commanded through an R/C system, but then as the same system grows it needs to be commanded by a computer on the robot eventually.

I was thinking of something like the RoboteQ AX 2500

but it looks like it is only for DC motors, and in that case, I guess I would need to do some control and then I would also need a brake to make it stay at the same location.

What are my options ?

Thanks in advance,

Jake.