Of the two saws you mentioned, (359 and MS260 Pro), both would be good options. However, I think they are both overpriced unless they were in pristine condition. Both of those should be able to be acquired for $300 or less.
One poster mentioned attending the GTG being held in the vicinity. That would really be a great idea and allow you to actually cut with different models of saws. You may leave with different opinions than when you came. Bring your cash and you may leave with a saw, they're usually available at those events.
Don't be in a rush to get something if you don't have a current crisis (like a tree down across your driveway) Do some more reading on this site and try to find someone that has saws you can cut with. Another thing that is helpful is to realistically assess what you will be cutting and acquire a saw appropriate to that task. (buy a saw for what you will be cutting most often, not what you "might" cut on rare occasions.
There have been lots of posts in the past on how to assess a used saw. Searching may turn those up.
Well its one reason I came on here. To get the input of you all. He may have them priced so high because he probably buys, cleans, and sells them. Which might not be the best way to purchase one for sure. I'm not so much in a rush as I am ready to scratch the itch I have. I am really going to consider the GTG. At the same time, I am not a professional and of course the big nice saw is going to appeal to me. I am wanting more power is all. I think it would probably come down to a weight thing for me. So playing with different saws might make me more confused than I am right now. lol Not to say its a bad idea though.