The one thing I would say is to go with tighter rather than looser because when it gets really cold you want no part of a baggy wetsuit that can't warm up because there's too much water in it. The hoods are going to be hard to get on, but that's good because then it won't fill up either when duckdiving, and you just get used to it.
And try on a bunch of brands, don't just get stuck on quik, try to find one that fits perfectly before you invest, they aren't cheap to replace