If you're looking for a mill to convert to cnc I'd go with harbor freight's small mill. It weighs over three times as much and
cncfusion sells a conversion kit that includes ball screws. I will warn you that making your own cnc will require a huge chunk of time, and learning how to use it effectively will require even more. If you're looking for a manual mill I'd ask some of the machinists that float around these forums. They know much more than I do (I have a degree in textile design, robots are just a hobby).