Coyote Bob, A few years ago, I had the opportunity to test a Swarovski, Leica, Bushnell, Leupold, and a Nikon range finder side by side.
I settled on the Swarovsky, which was, like all the others rated for 1300-1500 meters.
All of them, up to just over 700 meters would easily meet your needs, regardless of price.
All of them were within 3 meters of each other until the ranges got further out.
All of them, except the Bushnell were would give readings out to 900 meters, the Bushnell was either unreliable or just wouldn't read, even on the side of a building.
The next ones to become unrelable, just under 1000 meters were the Nikon and Leupold.
The Leica, was reliable to 1300 meters on Deer sized animals or 40cm diameter trees.
The Swarovski lived up to its claim of reading reliably, on a clear, cool day, without mirage on Coyote size game to 1200 meters and Deer out to 1500 meters.
When it came down to choosing which of the range finders I would choose, I chose the Swarovski because it let in the most light, had a large exit reticle, which made the object easy to find, 7X magnification, long battery life, even when used in -25c weather.
Mist and mirage had an effect on all of their readings and the acquisition of specific objects, even up close.
The biggest issue with these RFs is the sharpness of the optics and the light conditions when you can see the object you want to get a range reading on.
Even at 600 meters, you need glass with excellent clarity and light transmission. So if you get the chance, check out a couple in low light, which is often when you hunt Coyotes, especially in early morning.
If the reasonably priced Vortex or Bushnell will work for you under the above conditions, so be it. There really isn't anything other than snob factor in going for the more expensive product.
The Swarovski and Leica had the best optics, but the Leica had a small exit lens, and made object acquisition difficult at distances beyond 350 meters, unless you had something to steady the unit.
The Leupold had good optics, as did the Bushnell. The Nikon had excellent optics and was good even under low light conditions.