We're just getting into sledding and I've got my eye on a 2007 Summit 800 151 track with the Adrenaline package listed for $6000. Is this reasonable? It has a new motor with low KM's on it. I'm looking for something for playing in the powder along with banging down some trails. Is there anything to watch out for with these sleds? I can't help but notice a lot of guys have rebuilt their engines? Is this something to watch out for? I just don't want to get a sled that's going to leave me stuck. Thanks.