Not to say that lighter won't make a difference, just that in our weight class (I'm currently 200) I would personally recommend a stronger wheel with less of a weight savings over simply looking to save as much weight as possible.

I was/am currently in a similar boat. I haven't reached my weight goals, though I want to upgrade my wheels (for the reasons above) and thought it would be an easy way to save 400+ grams. The more I research it, the more I am finding that wheel weight should take a backseat to actually getting the right wheel for the rider and the types of riding he/she does. Weight savings will (usually) be there, and are a bonus