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I have purchased 5 8078 stepper drivers, and 5 Nema 23 steppers. I am very happy with the quality of all.

I chose the 8078's over geckos so I could have an even more resolute microstep.

I also...

Check out the bearings that Igus sells. I used them in my router, and they work awesome. Check my gallery for pictures.

http://www.igus.com/dryr/dryrji.asp

Looks like a project I just finished up last spring. Looks good.