I just bought a new Polaris and decided on the 500 Sportsman instead of the ATP because of the rear suspension. The independant suspension is more important to me because of the terrain I have to traverse. If the ATP had the same rear suspension it would have been a tough decision. As for payload, I carried two quartered elk loaded together out of a really harry canyon on my 400 Sportsman so I know the 500 in any configuration will do the job at least as well. As for the power question, my brother has the 330 and it just don't seem like enough power to me. Of course he lives in Texas and down there it works OK, but when he hunts with me here in Wyoming, I do a lot of waiting and have had to pick my trails to allow for him to follow.