Hell, I still run my old Shreveport built Poulan 3400 and 4000's with both bar and bow (imagine that)and quite enjoy the power and efficiency of these old machines. Heavy yes, tough as hell, yes. Automatic and manual oiling for that little bit extra lube when needed. I also use my 15 year old ms290 quite often. My stock and modded Husky 272's are a model of efficiency and take the brunt of the bigger stuff. Still use a mac 10 quite a bit again with both bar and bow. Love the feel and efficiency of my old ms440 but hate the lack of fuel efficiency. My main, go to saw's these days seems to be my muffler modded Echo cs590 (purchased due to curiosity for $175.00) and an old 50th anniversary Husky 50 golden anniversary. 20" on the Echo and 16" on the Husky. Both crank real easy and both cut fast while sipping fuel. In brushing and bucking pine tops nothing beats a bow properly operated but they are definitely not for the inexperienced. Only one way to get that though.
Get the very best saw you can afford, service it obsessively and it will definitely provide a lifetime of amusement, pride and joy. Nearly all of mine were purchased new or nearly new and the reference to the mac10 might just give away my age.