To be honest, if once a week/ all day use is your intention, I would definately look at a new saw. That amount of cutting warrents a new saw. No idea if you have experience at rebuilding saws, but used equipment, irrespective of how good it looks, is always prone to early failure! If you don't buy from a experienced person the chances are high that you might get garbage!
First off I would contact one of the well respected rebuilders or dealers here at this site to see what they have. Names like "nmurph, tladrum, etc." guarentee integrity! I would without a doubt buy from one of those fellows!
Second, if you don't find a product you like I would buy a brand new saw of known quality. Brand names I trust and use are:
Dolmar=Makita, Efco=Oleo Mac, Echo=Shindaiwa, Husqvarna=Jonsered=Red Max=Zenoah, Solo, Stihl, Tanaka=Hitachi
What would I buy on a budget?
For 60cc:
Echo 590 (~400$), Dolmar 6100(~500$), Echo 600/620(~550$), Husqvarna 555(~600€)
For 50cc:
Mc Culloch 5020(~200$), Dolmar 510/5105, Echo 510/520/530, Husqvarna 545
Good luck!
7
Mebbe you mean "Poulan Pro" PP5020? Don't get hung up on the "pro" stuff. I've got a lot of hours on one in big wood in the 2.5 years I've had one. Couple of inches narrower (that stupid "soft-start" stuff!) and a pound or two lighter, and it'd be near-perfect. For $200!!!