The 750W servos would be my first choice. More than enough power for that machine, and an order of magnitude above a stepper motor performance wise. Servo motors have a nearly flat torque curve through their entire operating range. NEMA 42 steppers are about useless, the torque drops off so fast with increasing RPM that a good NEMA 34 stepper motor will outperform them overall.
As far as rapids, 200 IPM is way more than enough for that machine, I run my BP clone at not more than 100 IPM rapids, but it will rapid at 300+ IPM.
For servos, I have used and recommend:
Delta https://www.automationdirect.com/selectors/sureservo2
LS Electric https://www.automationdirect.com/selectors/ls-servo
DMM https://store.dmm-tech.com/
I have Delta and DMM servos on my lathe and I just installed two 750W LS servos on another project. Documentation is important as is the setup software and factory support. All of these get an ''A'' in all categories.