Here is what I like:
Quaker Multi Grain Cereal. I think 1/2 cup DRY is one serving (so that's one cup cooked and that's what I have!)
We ran out of that the other day so we are using Quacker Oats, not instant, but not the kind you have to cook forever too. They are ok in a pinch (boil water, add oats, cook one minute, done!) but kind of bland (I just add raisins to mine, DH has raisins and 1 tbsp brown sugar).
I really like some oatmeal that I got at the health food store once, but I forget the brand. Anyway, I had to cook this oatmeal for a little while, it was my favorite. The oatmeal stayed pretty whole and didn't get too mushy, so there was a bit of texture to it. It wasn't like a messy glop of stuff that had disintegrated, it held onto it's original shape. I really liked the flavor and texture of this kind of oatmeal.
I also got something from the health food store - Bob's Whole Grain cereal (something like that) a mixture of wheat, brown rice, barley, oats, flax seed, and a whole bunch of other stuff. The dry serving is only 1/4 cup but it really expands once it's done cooking (takes about 10 minutes, just cook in water). I really love this stuff but DH says it's "just ok".
So the Quaker multigrain cereal has won out for now. I am a reformed oatmeal/hot cereal hater! I love the stuff now, it keeps me plenty full through the morning and helps to fuel my workouts. If you don't like the taste of plain oatmeal you can add so many things - a drizzle of maple syrup, brown sugar, splenda, dried fruit, chopped nuts, maybe a little jam or jelly, etc. Let your imagination run wild!
I also have an omelette made from just egg whites for protein. I just sautee up mushrooms and peppers to add to my omelette. This is actually a pretty huge breakast but I like to have some protein along with my carbs and it really does the trick at satisfying my hunger!