If you are cutting average 18" stuff but want plenty of power for more, I'd scrimp my pennies for one of the third class of saw I have up in my earlier post. Others I'd add to that list are the Husky 372XP and as mentioned Jonsered 2171 IF you can find them. I hear they are hard to come by.
Seeing as you're in PA, you're probably cutting hardwood. In my opinion (and you know how opinions are) a stock 60cc saw, while perfectly capable of cutting a 24" log, just doesn't fall into the category of "plenty of power" for me.
If that isn't in your budget, then I'd look at, in order of expense, a Dolmar 7300 at $649, Stihl 361 at around $600, Husky 359 at around $550, a Stihl 390 for $459, a Stihl 310 for about $400, and then the Stihl 290 for $370 or so. I'd skip the Husky 455.
Personally, I' skip the Stihl 361 too. If I was dropping 6 bills on a chainsaw, I'd save a few more pennies and get the Dolmar 7300. You get a 73cc saw for not much more than the 59cc Stihl. And in addition to that, if you think you need more, buy a
big bore kit for it from Bailey's for $109 and have an 84cc saw.
just more opinions to confuse the issue
,
Ian