Thing is, I need something I can walk in to go with dresses or black trousers for those times when trainers or Birkies are not smart enough. Really I prefer something with a strap, but can't see any flat ones that are even borderline nice. I do take the points about ballerinas not being good for your feet, but need something presentable for smarter days.
Happy to consider suggestions - I have fairly wide feet which doesn't help. In my dreams I wear Irregular Choice shoes, but not IRL!