The only experience I have is with the scope)cam. It may not be the least expensive option, or it may be.??? I just know it works great. It's easy, and even though it doesn't look like it in video, it's absolutely crystal clear at that distance. My friend said he had an option for stabilization so he clicked it. He's not sure if thats why it's not clear or not. That cow video on here is about what the 1500yd coyote looks like for clarity when you view it directly from sd card. The other videos I got out to 950 are sweet.
Plus, I have a very good quality camera for pictures after I video my long distance kill shot. And it's very small. I've been playing around with it for about two weeks now, and love it.