The only folding bike I would be willing to recommend is a Raleigh Twenty with a steel seatpost - steel frame built like a tank. Put on some multi-spoked BMX wheels and it will whistle a tune while carrying you. You won't be whistling a tune carrying it though. But you won't break it. It folds, theoretically. But hopefully soon you will be in the weight range of modern foldies and then you can make any choice.