Did you change your mind about compressed neoprene after trying the Ri-2100? If not, how about the Bare XCS2, 2mm compressed neoprene? I believe it comes custom sizes and is supposedly quite stretchy.
Or are you wanting 4-6mm neoprene for the thermal properties?
True on the first one. A number of things here that explain my view on neoprene suits as it stands at the moment.
1. I tried a non-compressed neoprene suit and it was the best suit I was in. It was very soft and stretchy and there was no suit squeeze at all. Neoprene would gentle stretch around you and form a tighter glove. This suit was also a lot more warmer in shallower waters. When I was deep, compression would thin the suit and more undergarment was needed but it would still be better than any of the shell suits I tried.
2. Crushed neoprene like Bare and DUI did not have the same softness and stretch that non-compressed neoprene would have. Sheets of neoprene had been pressed until bubbles in them were smashed and all the flexibility was dead. Result was a shell suit that was super tough. It was still more stretchy than a kavlar shell suit and retained its insulating properties as depth but did not behave like a regular, non-crushed neoprene suit.
3. Ri-2100 was not crushed neoprene like Bare or DUI CF series. The suit was thicker and denser but it still had some "meat" to it. It was the heaviest and the most difficult to press on but it would still have some "give / softness" to it. It would retain its warmth at depth at the cost of taking your flexibility. Had this been a looser fit then the suit may have been perfect but since it was tight, I had major issues reaching valves.
So when you summarize the advantages and disadvantages they would look something like below.
Regular neoprene:
Pros: Most comfortable flexy. No squeeze. Cheapest.
Cons: Loose thermal properties at depth.
Crushed Neoprene (Bare and DUI CF200): Pros: Bullet proof durability. Lighter than Compressed neoprene. Do not have as much warmth but do not lose insulating properties at depth either.
Cons: Expensive. They squeeze almost like a shell suit since material does not have flexibility. Ideal fitting as crucial as a shell suit.
Compressed neoprene (Ri-2100): Pros: Cheap. More flexible than Criushed neoprene but less flexible than regular neoprene. Mosr suit squeeze than crushed neoprene but less than regular neoprene. Require less undergarment than any of the above. Maintain thermal properties not matter how deep you go.
Cons: Heavy. Since material is not flexible, fit is as crucial as a shell suit and whoever makes them better do a good job or you will have a great suit that does not want to give an inch when you reach your valves or move around much.
In the end I would like a suit in which I can move around. I am willing to compromise on crushed / compressed as long as it fits well.