With what the cost of a new DP is, you could also find a mill for about same price or less in used market. DP's to me is hard to justify buying new for that once awhile need. Like others I have purchase used the older delta/Rockwell DP for about 250.00, have to keep in mind that there's a good chance that the previous owner only used it only few times. Like Tom saying a good brand would be the older PM's I had chance while back to pick up the 1200 for 500.00 but I have a mill that will do the same thing then some.
I might add to this is to search for a DP that is 3phase and put you a VFD on it so don't have to keep changing belts when need to change rpm's