I would just go with any of the nice XC width 29er rims you listed. I wouldn't go wide like the blunt, because it might flatten out a 32 too much. If you're sticking with wider tires I've heard good things about it though, and its cousin the VXC. I have a Delgado Cross on the back of my cross bike and I think it works great with tires from 28-42, or probably even bigger, though I haven't run larger because of clearance issues. For your bike I might go with the normal delgados instead of the cross just because you don't need a rim brake surface. Or you could, for versatility down the road.