Just to update, I decided against the linear drivers when the author of the boards informed me that running a 22V supply would be way too much. At that point, I realized the power the driver could deliver to the motor would be limited, and the system as a whole would be less likely to be satisfactory for the Taig.
What I'm planning at this point is to use the HobbyCNC drivers with their 205 oz-in (unipolar) motors. That's more holding torque than the bipolar motors I was considering (166-185 oz-in), so I don't expect problems. On the off-chance I'm not happy with the system, those motors could be used with a Gecko to produce 285 oz-in in bipolar. So, I would lose the investment in the inexpensive drivers, but nothing else. Of course, my plans to purchase the HCNC board could still change if I run into problems fabricating the dampeners. I have the materials; it remains to be seen whether I have the skill.
