Sorry for the long winded post, but here goes..
Other than the beneteau, all of those boats are rated ocean class A, which means they are not supposed to fall apart. However as history shows it's usually the crew that gives up before the boat, so you need it to be easy on you as well.
I personally really love the hanse, seriously considering the 400, but mostly for coastal. If you look at the 400 or 430, I think you will find no handholds either above or below decks. So you would need to add things like that.
I didn't see Jeanneau in your list, but if you are considering beneteau it might fit well. Personally, I'm not a Jeanneau fan out of aesthetics and design.
The owner of a local seattle dealer, marine service center, is currently circumnavigating in a Jeanneau 49i. Their blog is here: Ruby Slippers » Rard Family Ocean Adventure
I think that gives you an idea of what is possible with a production cruising boat, I'm sure you could contact MSC direct to see how they outfitted it, or troll through their blog for nuggets. I'd read the wife's posts to try and eliminate any bias the guy might have as a jeanneau dealer
I know that doesn't help you with center cockpit, I like the concept of center cockpit, but I wouldn't narrow to Beneteau just to get it if I was seriously thinking about crossing oceans. I'd widen the net first.
Check out myhanse.com for hanse information if you haven't already. someone took a Hanse 371 across in the ARC, and I think they won in their class.
I think if you are staying out of the northern lattitudes, center cockpit is less necessary, depends on your cruising goals. Check out the information on mahina.com on cruising boat selection as well.
Best of luck,