I would go with the pinnacle hooded vest. It has a neck seal that works very well with the neck seal on their suits. I have the 7mm (not merlino) full suit and the 3/5 hooded vest and I'm very comfortable even at depth at Dutch. I have also dived there in a 4/3 full suit and generic hooded vest. Not back above 30 feet, but not so great for long periods below that depth.