And speaking of the drivers:
I have chosen the IMS drivers for their reliability, simplicity, size and characteristics . I already have them in my CNC mini mill and am content. I have worked with them before at a CNC machine shop.
I had used all 4 IM483 and only had exactly 2 IM804 left. The 804 can handle higher input voltage ( 24V to 75V ) and output current is at 4A RMS.
For those who are familiar with the IM804: Yeah, I know it is overkill, but for the fact that I did not have to spend more money, they will do the job nicely. BTW: IMS was acquired by Schneider Electric a few years back - http://imshome.com.