I use Mavic A319s ims for commuting/light offroad. Not light but they are inexpensive and fairly tough. I have re-used the same spokes when replacing an Open Pro rim with an A319 - they were DT Champion stainless double-butted, no probs so far.

If the rim is deforming like that, it may be that so much metal has been worn away that air pressure from the inner tube is pushing the rim out. Watch it!