I don't have any experience with the kolpin winches, but I would stay away from superwinch or any cheaper, off brands. They are slow and not nearly as strong as the warns. I installed 2500 pound warns on my last two which isn't too bad. I'm not a mechanic and I didn't have too much trouble.
Iím a great believer in luck, and I find the harder I work the more I have of it.