A good plastic binding is honestly no weaker than metal. At the same pressure you'll crack it you'll bend aluminum. Either way your screwed.
Flow NX2's. Canting, full aluminum. It's really either that or Rome. Union isn't canting anything till next year and the only metal part is the heelcup. Majority of the frame is nylon.
ill take my chances with a bend rather than a crack (:.... i was looking at the nx2's since they have everything i want and more but I dont think ill respond well without a proper toe cap :/ i really wish they did something about that