Dealing in metric feels a lot like eating vegetables I hate. I know I should, I know it's good for me in the long run, but I sure don't like doing it.

LC has some carbon steel sheet pans that are absolutely fantastic. We've been using them damn near every day for the last six or so years, no warping yet. Hand-wash and dry if you want to keep them from rusting where the edges curl, though - husband learned that one the hard way.