All of the advice on here is good advice. My two cents:
I own and dive a BARE suit. Don't know the model. Isn't that bad of me? The reasons I dive a BARE are:
--got it for a great price!
--had to select off the shelf but it fits really well with the exception of the legs. The legs are about 1-1/2 to 2 inches too long for my short squatty legs. None the less, it's not a bad fit.
Always get a dry suit that fits! Can't say this enough. Other thoughts:
BARE (I am sure DUI too) has a neat little feature located at the waist. It's a "vertical elastic" joint type thing that allows the suit to adjust/stretch the distance between your shoulders and crotch. It's not much adjustment; but it's just enough to make the suit comfortable without resorting to a custom cut.
Also, I am surprised no one has mentioned this before. You definitely need these two features. Trust me:
--you need a a suit with a self-donning zipper that zips diagonally across the front from your right hip to up and over your left shoulder. This type of zipper is truly self-donning. No marketing hype. I can donn and doff my dry suit all by myself. Ask other dry suit owners to do that.
You also need a suit (again, I own a BARE - so this is where my experience is), which has a second "barrier" zipper. All dry suits have the "dry zip" that everyone is familiar with. My BARE has a standard mechanical zipper over the top of the dry zipper. The mechanical zipper helps protect/guard the dry zipper from the perils of foreign debris incursions and mud infusions. In short, it helps protect the precious dry zipper and prolong its' life.
Tri-lam or crushed neoprene? I don't know. Different opinions here. I have a tri-lam. Everyone tells me it's lighter (less weight) than the crushed neoprene version. I don't know that I can tell the difference.
Hope this helps.