These are good GB's:
Planetary Gear Box gearbox manufacturers gear reducer Canada USA Australia
I purchased three of them for a retrofit on our table to fit up to a CandCnc servo system. 12:1 ratio for this servo system gives me a 800ipm top end, which is plenty fast for me. I have it squeezed down to top out at 680ipm.
A dragoncut is stepper I think. A 3:1 is the preferred ratio it seems for steppers.
The arc minute we have is 10 and it has smooth quite motion with no detectable backlash (yet LOL).