In my quest for a new hunting rifle, I'm not sure yet on a scope. The gun will be used from 20-400 ish yards on whitetail. I know that a simple 3-9 is plenty to shoot a deer at 400, but what about to id it? How much magnification do I need to tell between a doe and a spike at 400 yards? Obviously optical quality plays a big role, and in most of the scopes I'm looking at, the optical quality is fairly good, and none of them are far above/below the rest. Is a 3-10 enough, or should I go with 12x or 14x on the top end? I don't tend to carry binos for my type of hunting, and definitely not a spotting scope.