Do any of these options have a case that feels sturdy? It seems a little silly describing it this way, but one of the reasons I keep coming back to macbooks is the aluminum case. I want good specs, but my lizard brain also wants a laptop which doesn't feel like a flimsy plastic toy.

Dell XPS 13 Developer Edition is a good laptop.

Ah, fair enough. I think Purism cases are all-metal. I have not touched one though -- going to once they release a 32GB model.

System76's Oryx Pro has an aluminum case.