I run a 16 inch Stihl and a 18 inch husky.
Unless you really, really need a big motor or a 20 inch bar, most would probably be fine with a smaller bar and a smaller motor (and price)
That said, I would go with one of the bigger names, they're well known and trusted for a reason. Lots of people say my xxx brand works as good as a Stihl thats twice the price, but when seriously cutting wood for the winter, or for hunting camp, I've yet to see one of those that really did hang.
"If there must be trouble, let it be in my day, that my children may have peace"