Thanks JAZZ,

The UC300 USB motion controller goes to 100kHz so that seems ok, I only suggest that one because I have used the smaller UC100 with total success and the price is pretty good too. However I do not know yet if that interfaces direct with the servo drive unit?

Not having a high power PSU is a big plus as well and as there is no price difference it looks like servos have won the toss :)

Would you go with 750W motors or smaller??

2:1 reduction for resolution & torque increase, more?

Servo drives seem to have lots of settings, what is used - speed & torque, positioning..... All new to me but i have the manual for the drives now.