I would keep saving your dollars and raise your price point .... while you can get a rifle that will do the job, getting one and some decent optics not too likely for that price where in a short time you very may be wishing you had It is JMO ... but adding $100 - $150 your going to get a LOT more gun quality and budget to get a decent scope too.
Coming from a Air Gun Newbee, I think Coyote hunting with any of the Air Rifles you listed should NOT be undertaken. I would never hunt ANYTHING with any gun that could not provide a "Clean Kill".Snakebite