keep in mind the money you're gonna get from the timber will vary. i don't know much about pine, but like others have said, grades depend on top diameter inside bark, straightness, grain spacing, knots, diseases, species, and the market prices will vary with supply and demand. talk to foresters and scalers. if you plan on doing sustainable harvesting over the long run definately talk to foresters. sometimes its best to to selectively take trees, but other times some species are not shade tollerant and will not grow back in a thinned out forest. clearcuts can be good; most people don't like them based on aesthetic reasons. foresters i used to work with said around here clearcuts combined with replanting proper species percentages are good, because douglas fir is the predominant tree species and is shade intollerant. so if it was selectively logging, after a generation you'd have an unnatrual species breakdown, with a whole bunch of hemlock and balsam, and very little douglas fir....so long story short, talk to someone that knows about the ecology of your area, tell them your plans, and then decide what will best suit you. oh yeah, and find out the preferred lengths the mill will want for each grade. it would be a shame if you bucked a bunch incorrectly and part of each log went to waste.