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Well, just to start off with if the size is not an issue, you can always repair your current dry suit.
Now of course you can't make it larger if it "shrunk".
I personally think DUI dry suits are really nice, but are overpriced (more than the already overpriced other brands).
I have a BARE HD Tri-Lam front entry with neoprene neck seal, BUT with latex wrist seals. It does not have a built in hood, but had built in boots.
I really like the neoprene neck seal as it is warm, easy to use, comfortable, dry and will outlast latex. I have the latex wrist seals, because they are comfortable around my wrists and are very flexable. Now they are much more delicate than the neoprene, but wrist seals are cheap and easy to replace myself.
I like the Tri-Laminate, but I think I might like the super compressed neoprene type better just because of durablility on wrecks and such. I also have big heavy duty boots built into my dry suit, if I could do it over, I would have built in boots, but something less heavy duty and large. They are very difficult to find fins that they fit into and also create a lot of buoyancy.
I would also say stick with the across the chest type zipper as the rear across the back style are difficult to get in and out of. Make sure you get some type of knee pads built in or aftermarket to protect your investment.
I don't know about the dry gloves or hood as I still use a traditional wetsuit hood and gloves. I don't ever have a problem with a cold head or hands, but I am a very warm person.
As far as undergarments are concerned, I have the DUI polar fleece undergarment, and it is nice for warmer waters (above 50 degrees). If you are going to be going in colder or icy waters I would say go for the Weezel undergarments. They are much warmer and made very nicely.
If I was going with DUI I really like the CF200X as it looks like it will hold up for the long term. Most of the divers that I know which also have DUI suits, have the CF200X.
Now, really all of that is biased on the type of diving I do, so it is going to depend on what type of diving you do.