I wouldn't think of milling with anything less than say 60cc and that is working it hard. Milling burns saws out. I have a 120cc husky and an alaskan mill but I would always try to get the log to a big bandsaw out of choice.
I would agree.You really want a saw with some good heft,and realistically,unless you're thinking of doing quite a bit of milling,I wouldn't bother.Remember that with a chainsaw mill,you loose 1/4" with every pass.On a small log that is not really practicable.Hope this is of use.