PC controlled motor as a variable load ?

Hi,

I was hoping someone could help out with some thoughts on EV type motors & controllers in a stationary PC controlled situation.

The need is to control and monitor rpm and negative torque where the driving is provided not by the motor...

So how to best use a motor as a variable load ?

Is this easily implemented with any of the motors & controllers popular here? About 20Nm max & <1000rpm intermitent would be good :)

Would the Crystalyte 500 type motor be a good choice for this? Is there any PC supported motor controller that I can use to achieve these goals ?

Cheers & thanks in advance for any assistance out there !