If you are buying new I would first consider an ms280 with 18 or 20 inch bar whichever feels better to you as far as comfort when using. If a little more weight and $ is not an issue take the 361 with 20" bar. MS 260 would do a very good job also close to the 280 but slightly less power.
Some older models if you buy used I'd go for : 034,036 (great power to weight ratio ), 028. Most of Stihl models you should pop of the air cleaner cover and lightly tap the air cleaner to dislodge the sawdust accumulation on the filter now and then to keep it breathing efficiently. I would trust those Stihl models above most any other saws for reliability,well worth the extra attention the air cleaner should have.
Other then those I would be tempted to try the Dolmar 5100 if I had a good parts stocking dealer.
Some older models if you buy used I'd go for : 034,036 (great power to weight ratio ), 028. Most of Stihl models you should pop of the air cleaner cover and lightly tap the air cleaner to dislodge the sawdust accumulation on the filter now and then to keep it breathing efficiently. I would trust those Stihl models above most any other saws for reliability,well worth the extra attention the air cleaner should have.
Other then those I would be tempted to try the Dolmar 5100 if I had a good parts stocking dealer.