There are several high fiber cereals and breakfast bars that also make a good breakfast. Kashi Go Lean has become one of my favorites. Most of their cold cereals have around 10 grams of protein and fiber. There are many cereals that have a lot of sugar, but I have found these to be a very healthy cereal.
Sometimes when I have had a long day and am too tired to cook, I will just pour myself a bowl of this cereal in the evening. It always leaves me full and satisfied - especially if I eat a piece of fruit with it. That gives me even a few more grams of fiber.