I need some help selecting some upgrades. I got a 455 on CL for $150, I sharpened the chain and have bucked up a couple of trees already, runs really good. It's a 20" bar and the oiler has been set on 2, the chain is stretched bad and I think the bar should be replaced too. Plug and filter are good. I was gonna use a oregon 72lgx chain, power match bar and a powermate rim and drum. How does that sound? any other recomendations?