HH make awesome jackets, I board in one. Their HellyTech is just as good as Goretex at keeping you dry. They originally made jackets for sailing in Scandinavian conditions.
The only thing you'll miss is a snowskirt, and a goggle pocket, and possibly vents, I use my goggle pocket to carry nappies for my daughter, and while the snowskirt is useful if you're in powder etc. You'll be totally fine without. The Vents are however very useful if you board in varying temperature conditions.
The most important parts are your boots and trousers anyways!