Thank you hanermo.
I am really impressed to hear that a Neme 23 can move a 200kg gantry - even with some gearing. So my measly 60kg gantry should not be any problem?
I have not really considered servo motors because most DIY people seem to be using stepper motors, and it is my empression that servo motors are more complicated to use and much more expensive. Also, I think you can get a Nema 34 and driver cheaper than 290 Euro (cannot find that symbol).
I am convinced that brushless servo motors are excellent - maybe I should look more into that.