A couple of things to consider...
Any custom fitted suit will usually keep you warmer than a stock suit if you aren't a stock size...and most of us aren't. (No one makes a rack size called "jumbo shrimp")
Wet Wear makes great custom suits. Their neoprene is Rubatex which doesn't have the same compress-ability as most neoprenes therefore a thinner Rubatex suit can keep you as warm as a stretchy but thicker neoprene can...Usually you can downsize one level so a 5mm can substitute for a 7mm stretch, and a 3mm is as warm as a 5mm stretch.
I personally have one of their 3mm suits which was as warm as the stock 5mm suits and with a vest equaled my 7mm.
I also have a 5mm to get me through the winter in 68deg water.
Wetwear suits seem to be nearly indestructible...most folks I know who have them have worn them forever and the suits are still going strong.
The downside is that unlike those ultra stretchy neoprene suits that compress at depth, is the suit must be an exact fit...they have little room for weight changes in comparison to an old Henderson Hyperstrech, I could change 4 clothing sizes and it still fit great...my rubatex suit got uncomfortabe when I "grew" - another middle aged woe.
Wetwear does have some neat features. The back zippers are extra long at an angle from lower left hip to right of the neck - giving you more room to pull it over hips & shoulders.
Long zippers at ankles and wrists make it very easy to don and doff...and on a warm day I like to unzip arms and legs during the surface interval to cool down in the sun.
Seals at the neck, wrists, and zippers help reduce any water flow which affects overall warmth.
