I have build a machine too , and i use a home build steppendriver with a L297 & L6203.. (
www.arjan-swets.com)
It works alright . Later a saw that there also are microsteppers.
because my machine works much beter on half step than full step, I think more steps is better??
and is there a internetpage with a homebuild microstepper....?
(sorry for the bad english)