I’m a Henderson fan. I’ve got one of their 5mm, 3mm full, 3mm short, and a dive skin. I’d buy from them again in a heartbeat, but I agree with those above...if you can rent a suit easily enough to verify it’s what you’re going to want and it’s going to fit properly...I’d do that first.
On dry vs. wet...that’s a call that you’re going to have to make. Ex. If you rent a 7mm wetsuit and you’re comfortable with that...I’d pick one up just so you don’t have to worry about renting (whether or not your size Is going to be on hand when you want to dive).