Well, I see we're barely even 10 posts in, and someone has already recommended a $600-$700 pro saw (Stihl ms261).....

Ten inches isn't much, and you could easily get by with a Stihl ms170, or even a Home Depot Echo. My main suggestion is, if you're only going to use it occasionally, is spend the money on the "TruFuel" or whatever "canned" fuel is available locally. Yes, you're gonna cringe at spending $5 for a quart of the stuff, but it will be well worth it when you go to start the saw next year, and it actually starts, and you don't have urges to throw a $200-$300 tool into a pond, or waste half a day removing/cleaning/rebuilding/replacing a carb.