Dry suits are the way to go.
Don't let Lobzilla's experience sway your opinion, these are not the words of an experienced dry suit diver, these are the words of someone who doesn't know how to use a dry suit properly.
You can do anything in a dry suit that you can do in a wet suit, and you will be warmer and more comfortable than if you were in a wet suit.
Experienced dry suit divers prefer to go dry even in moderate temperatures. I dive dry when the water is 75 degrees or cooler. During inclement weather (wind, rain), I have even gone dry when the water was 80 degrees. While others are shivering during the surface interval, I was toasty warm.
I love the flexibility of the trilaminate suits. Not only is it easy to move around in a trilam suit, but you can wear an infinite variety of undergarments to suit the temperature. I can wear everything from a skin to a snowmobile suit underneath, depending on the water temp.
Oh, yeah, a trilaminate suit drys in minutes.
Harry, could you please try the following:
Hover horizontally at depth, loft the suit to your liking, adjust wing volume to be neutrally buoyant.
Now, rotate in a 45 degree head down position, hold there, and do nothing (except breathing) for 30 seconds. What happens?
Physics will take over and both the experienced diver and the novice will experience what an unstable equilibrium is.
The moment you get rid of the squeeze in a drysuit, you will have an air bubble that needs to be actively managed and compensated for.
Can this be learned? Absolutely, I got this under control in minutes (and according to Ed Hayes and another instructor well ahead of the normal leaning curve) because my brain has a lot of pre-exposure to highly unstable systems like uni-cycles and helicopters.
However there is no denial that the air bubble in a drysuit 'screws around' with you. If you are not convinced yet, try
this in a drysuit.
There is no argument that a drysuit is warmer and will allow dives that otherwise would be impossible because of hypothermia (cold water, long deco).
There is also a very high probability that you will find me in a drysuit in less than a month. However, my wetsuit is not going to be sold, just benched until the next summer. I like to feel the ocean, become part of it (when temperature permits), float like an astronaut in space.
On an entertaining note: I asked several dozend divers during the last week about their preferences on dry vs. wet. There seems to be a correlation between diving and sleeping preferences. Wetsuit (whenever possible) divers seem to prefer to sleep as naked as possible wherelse drysuit afficionados seems to prefer jamies.