it depends on the speed that you want to print at and if you want to use stealthchop2.
for stealthchop2 you will need 24v. at 12v the torque is not enough.
here are some other alternatives
Moons:
1A
https://www.moonsindustries.com/p/nema-17-high-precision-hybrid-stepper-motors/ms17ha2p4100-m-000004611110027529
1.5A
https://www.moonsindustries.com/p/nema-17-high-precision-hybrid-stepper-motors/ms17ha2p4150-000004611110015918
1.68
https://www.printedsolid.com/products/ldo-nema-17-motor-power-ldo-42sth40-1684