I second the 40 spoke wheel. The strength of a wheel is not the rim or the hub. It's the spokes. The more spokes to distribute the load the better. The rim construction may help resist twisting, but spoke breakage is all about the spokes.
I would have a 40 spoke wheel built up custom with Wheelsmith or DT spokes. This way you know you are not getting some cheap offbrand spokes that are more likely to be defective. A defective spoke is going to quickly make itself known with your weight.