I have always heard the "rule of thumb" when buying a scope for a new rifle is that the scope should cost 2 or 3 times the rifle cost. I am to poor for that. Or have been. Maybe now I can swing it. But, I want to hear your thoughts. Is there a "rule of thumb" you have in mind like the one I have always heard? Or is it just buy what you can afford as close to the feature set you can?