I would suggest buying the largest mill your space and wallet can accommodate. The difference in rigidity between small mills and larger machines. is amazing. If your projects will include a lot of boring I suggest looking for a machine with power feed on the quill. I have owned a round column mill-drill, a Rong Fu RF45, and a full sized Bridgeport clone so I can speak from experience.. Another thing to consider is the size of work you will be doing. You can do small work on a larger machine, but not vice versa. If you have a choice between a Morse taper spindle and R8, I suggest R8.