So as you can guess I would like to get a boring head. It will be used on a PM-727 mill. Is there an appropriate size based on the mill size? Also if you could have only one boring head what would be the most useful size. Speaking of size I am working under the assumption that a 2 inch one is good for about a 2 inch bore. Money is an object in this purchase so any comments in that regard would be good too. It would sure be nice if I could find an article related to boring heads that addresses all this but I have had no luck finding what I am asking. Opinions guys?