I would think that it does not matter what the cost is since it all relative. What is your market like? What is the demand like for your products firewood logs or lumber. You would not be asking questions unless you think that you have a chance at getting a good return. In my area the demand has continually increased with the supply dwindling so guess what the price keeps going up. Buy the best equipment possible unless you think that the return is only going to be marginal. If you spend an enormous amount of time repairing fixing or rebuilding your equipment then you will not have too much time to make a profit. I have a budget for equipment so I keep buying brand new saws so working on them is not likely. It makes little sense to spend much time rebuilding saws when I need to be cutting. Thanks