Well I bought this one :
http://forums.procooling.com/vbb/sho...5&pagenumber=1
CNC conversion will cost me: 220$ shipped for three very powerful 253oz/inch Pacific Scientific Power Max II steppers, then 3x 114$ plus shipping for stepper controlers Geckodrive 201 also one of the best for desktop cnc , then 50$ for power suply for motors, and second computer I already have.
I could go a lot cheaper & weaker, but I rather listen to Fixittt and went for the best option I could find so my mill will be capable of doing some heavy work