Mike,
I`m going to make a few assumptions, tell me if I`m wrong because my recommendations will be based on them.
When you say you are going to buy a woodlot, I assume that you are referring to a stand that has already been logged for it`s timber. Based on that assumption, I figure that the largest trees that you are likely to be cutting are going to be in the 14" range. Assuming this is true, and that you must buy a Stihl, I`d recommend the 260, 280, or 361. I think the 250 is marginal for falling trees but would make a great firewood saw once those trees are down. Anything bigger than the 361 is overkill for this size tree and is getting quite pricey for a firewooder, especially for a first saw.
Not that every chainsaw isn`t dangerous, but things start happening so much faster with a bigger saw like the 460 which has the potential for much more reactive force in a kickback. Another factor to consider is that the 460 will work you with it`s extra horsepower and weight, but unless you work the saw to it`s potential, it won`t cut much faster than the 361.
I won`t recommend the 290/310/390. I just don`t like them. Many others here will probably tell you that they are great saws. They might be right in the context they use them and the way that you might.
Two saws are always good, twenty are better.
Don`t forget your PPE and at a
minimum, study the safety manual that will come with your saw.
Russ