Tony beat me to it. Echo. I'd say, of the cheaper saws they seem to have the best reputations.
But rbr, I still think you ought to at least talk to a dealer about a used saw. Something they have looked over, had as a demo, maybe even reworked after getting it for nothing and can sell it for cheap. I found an Echo that was new but a couple years old and I wish I bought it cuz it was dirt cheap. For that matter, supposedly Home Depot sells their refurbished Makitas (which are Dolmars and everyone here raves about what a good saw they are). Check with them too.
The little bit extra you pay ($50-75, maybe even $100 more) could get you a good, used saw with lots of life left and which is a much better saw than the Poulan, Homelite, etc that will last longer in the end. As for warranty, you'll need it on the cheap ones. And the features on a nicer saw make it much easier and safer to use. Poor anti-vibe leads to fatigue which leads to mistakes. Some of those cheaper saws leave your hands buzzing and tingling after use.