Eggs too are a good start to the day. I love an SW adapted Spanish tortilla made with potaoes and onions. The beauty of it is you can make it the night before and re-heat it or eat it cold.
I find with soup the length of time it is filling for depends on what is in the soup . I use things like aubergine and potato along with all the other veg, as a thickner and blend the lot and sometimes add a tin of beans or a jar of chickpeas afterwards. It has to be a good hearty soup to work.