Thanks for the feedback John. This list is a rough guide but a helpful one.
Good point on the unreliability of the published weights as they can disclude hatches, etc but for our purposes it was a general guideline. Kevlar boats have been the best candidates. I actually have a scale that I can use to weigh boats but lifting them usually tells us enough. When my partner and I check boats out the focus is more of the performance, fitting and condition.
We have been testing out boats in the water, still searching but fortunately not in a rush. Every month a good boat seems to pop up!