I stick by my commment that high waist trouser is the way to go (speaking as someone who used longjohns for years before I saw the light!). A vest is useful in the colder months, and gives you more flexibility with a single suit set up. In the UK water temp is pretty predictable, we dont have converging warm and cold currents. Apart from being more comfortable, a high waist trouser is a lot more convenient when you are way off shore, and last nights dodgy takeaway needs to come out in a hurry!
cheers
dave
www.spearo.co.uk