Ron,
The first question that comes to my mind is, and I'm not being a smart-aleck, but why have you settled in on a 58MY, rather than broadening your search to include the 53MY? Most people stumble onto a 58MY while searching for a 53MY. You're the first one I've heard of, other than myself, who has set out looking for a 58MY from the get go, and I did consider a few 53MYs and 58YachtFish (that's essentially a 53MY with a 5-foot cockit) during my search, but there were too many consequences in giving up the fourth stateroom for my particular purposes.
I have a 58MY, but I specifically needed four staterooms which is something the 53MY or the 58YF never offered. Without the specific need for a 4 stateroom model (and Hatteras only made a handful of them in comparison to the 3 stateroom model making them difficult to find after all these years), you may find, as have most others, that the 53MY is easier handle due to the fact that it has walk-around decks which the 58MY does not. The lack of visibility from the pilothouse and the flybridge on the 58MY is another down side to the 58MY that the 53MY does not have. And, the 58MY will cost you more in terms of insurance, dockage, and yard expenses when it comes to maintaining the hull bottom. I'm not trying to talk you out of the 58MY in any way - I love mine - but just wanting to make sure you see all of your options and fully understand the differences in order to make a good choice to get the most happiness out of your boat. If it's just a boat for yourself and you can live with 3 staterooms, the 53MY or the 58YachtFish might be a better choice in the big picture. We are unable to single hand our 58MY due to the obstacles I just mentioned and that's a bit frustrating. I also don't like not being able to walk around the outside in order to wash the sides of the "house", clean the windows, varnish the teak strips that run down the side, and any other maintenance you'll want to do to the sides. For us to do any of these chores, we have to leave our slip and go find a seawall to tie up to. But....I needed 4 staterooms in a boat under 60 feet, so there you have it. If didn't need the 4 staterooms, I would have without a doubt bought the 53MY or the 58YF.
The Series II 58MY with the 18' beam will cost you a LOT more for dockage. For example, I pay $1,180/month for my slip. If this boat were of the 18' beam variety, I'd be paying $2,411/month because I'd have to rent the slip that is wide enough which is designated for a longer, bigger boat, but still....I'd have to pay the market price for that slip regardless of what length boat I choose to put in it. Now THAT makes a huge difference to me!
Think about some of these things and if you can open your search to a 53MY or a 58YF, you'll find a lot more selections in the marketplace because Hatteras made a LOT more of these. They are GREAT boats.