If you are looking at a Trilam suit, there are a couple of different weights and stretch. Diving Concepts makes basically two kinds (others do as well) one that's thinner and has some stretch, and one that is very tough, but little stretch.
I have the heavier suit, at the time I was working with classes, which meant time on platforms, bumping up against stuff, etc. So I went with the heavier material. No complaints in general about the suit other than I have to remember to get a bit of slack in my joints before I go under.
If I had to do it all again I would get the lighter suit based on what I know. However, I don't do much in the way of wrecks, definitely no penetration, I also don't do caves. And since I don't do classes any more, the tough factor isn't that much of an issue to me.
What you need to do is figure out what kind of dives you will be doing.
BTW, I have a wrist dump on my suit and it works fine. Like anything else its what you get used to. I was diving with my buddy this weekend who has a shoulder dump and he was moving around pretty good to get the air out of his shoulder dump. Me I just roll a bit, maybe go nose up a bit to get the air out of my legs and then raise my arm. Going up a line is no problem, I have this right arm that's not doing anything
. My left controls my BC and suit dump. Turns out most of the time going up I'll just leave my arm up and let it dump as I go up, the squeeze is about the same as you would get from your shoulder dump. I control my bouyancy with my BC generally anyway.