If your honestly not cutting more than 6-8 cords/yr and the size is routinely 14" or less, the 250 will be a champ at a great price. Give a muffler mod/re-tune and it will be even better. If you doing about the same, but routinely up to 16"-20" get a 391 as the 311 and 391 are not a huge price difference, or weight difference but the power is noticeably better. Again MM/re-tune and you'll be quite happy. If you're doing more wood than that ( or may be in the future) I give strong consideration to the 261 (or a good used 261 or 261 pro) for it's lighter weight, better output and tougher design. Ditto for the 361, again in (more) routinely larger wood.
Any of these saws will serve you well and a lot of wood can be cut with the mid-grade saws, especially with sensible operating practices and diligent maintenance. That said, especially when used in good shape, the money can be similar between new mid-grade and used pro-saws, but the pro saws will stand up to more output, should you find cad and the outdoors calling your name more frequently. Quite honestly, if you think you're going to be cutting a lot, buy both of either series and always have the appropriate tool for the job. You can always buy pro saws later if/when you have the need/justification for them. I cut a lot of wood with a modded 039 and a modded 55 Husky before they burned up... I would make that choice again in a heartbeat if money was a concern. I do however, really like my MS261/372 setup, not what you're referencing or looking for, but I normally avg 22 cords/yr at least. Horsepower is addicting, beware...:hmm3grin2orange: