You might consider how you intend to hunt coyotes as a factor. If you're driving around the ranch glassing for them, you may want something upwards of 12x on the top end. If you're calling them in close, you may want to consider something with very little magnification or even using iron sights?

I use Burris 4.5-14x's on my .223 bolt guns when I'm hunting from the truck or snowmobile, a Leupold VX-R 1.25-4x (but haven't used it enough to form an opinion) or irons on my ARs when I'm calling them in.