Some of the later 43's had 485hp TI 6-71's, which had decidedly shorter lives, esp. vs. the N series (6-71N with 310hp by Johnson and Towers). The lower bridge is ideal for riding in a rough sea, since Hatteras did a study with gauges and the best location on a boat proved to be about 1/4 from aft on the lower deck.
Some of the later units were "tri-cabins" or lower dinettes, in which case the head the dedicated shower by turning the entire head into a shower.
Because these boats have a more narrow beam, plus V forward with a good keel aft, they ride exceptionally well in a head or quartering head sea. Beam seas are not your friend. Wish I had the stabilizers. We have literally seen other boats turn back in 3-5' seas, while we road at full cruise with no drama. I've also had other boats try to pass and fly into the air, which resulted in their dropping back behind us. So as other posts dedicated to the Hatt ride (you had a 58, so you know better than me), the ride is great.
The early boats had the batteries outboard of the engines (many complain), while sometime in the late 70's the batteries were moved inboard between the engines.
If you are coming down from a 58, you probably will not be stressed on the prices. The 48' Yachtfish was based on the 44' Tri-cabin from the late 60's early 70's. The 43' DCFB or MY were in production for a long time. If you are going to consider the 43'MY with the bridge-over-salon design, then why not consider the 48' CPMY, with 6V-92's I think, which was a (late 80's?) boat. Not too many made, but some posts on here about them indicate it is a nice boat and the hull can act as a displacement runner, if you desire. I think they are attactive and they did have the bridge-over-salon, but with a cockpit.
My 2CW...