i recently picked up a used husqvarna 455 rancher in great shape. stock 20" bar and chain is 3/8" pitch, .050" gauge, and 72 drive links. what is the best all around bar and chain combo for this saw? i live in the northeast and will be using it primarily to cut firewood, but will also be used to drop trees now and then. it will see a combination of hardwoods and softwoods. is there a different pitch/gauge/drive link combo that will get the job done more efficiently than the stock chain? and what about narrow kerf bar/chains? should these be considered? what do you recommend? thanks.