I've gotten away from most ready-to-eat cereal, but when I have it, I like something called "Mesa Sunrise," which has corn and flax in it.
If I prepare cereal, it's usually oat bran with chopped nuts, chopped dates and soy or rice milk. Or a mix of oat bran and another grain, like teff or quinoa or millet.
I'm usually too lazy to make much breakfast, though, so I end up with a smoothie made from chocolate soy milk (or plain, unsweetened soy with added cocoa powder and agave nectar), frozen blueberries, and a handful of spinach and/or a scoop or two of Vega smoothie infusion.