They will be fine. The stepper power has never been an issue. This had 42ozin steppers for the first 6 months in the kits, I only upgraded them because these large ones only added a few dollars more to my cost.
Spend you time learning about the ins and outs of cnc milling/routing, chip load, climb vs conventional, bit style, ect. All those have a much larger impact that a few tenths of an amp to the steppers. Have fun with it if you break something it is only a few dollars to replace it I tried to build something people would be scared to try. If you buy a really expensive machine you are much less likely to experiment with it, this is built to learn on for sure.