If you want durability, I'd go with a 32 spoke Ultegra hub, 14/15/14 butted spokes, and Mavic OP rim. Built by a good LBS wheelbuilder, you'll have a wheel that ought to hold up 20-30K miles without any problems. You could get a heavier rim too, but I think that may be overkill.
That Mavic OP is a very good rim, but it is a box rim and is more for vintage and touring bikes which is why it is very durable. The Shimano R500 rims are more aero shaped and have less spokes which makes it even more aero than a Mavic OP. Only issue you might have with a rim using less spokes is if one of the spokes breaks it could taco the wheel which means you could be walking, but that is usually more of a concern with ultralight wheels that aren't really designed to take everyday riding on rough streets like the Mavic OP and the Shimano R500 can.
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