I'm a huge fan of the Trader Joe's Organic High Fiber Joe's Ohs.
They're full of both soluble and non-soluble fiber, and are sweetened with just a touch of evaporate cane juice (sugar).
I usually start my day out with a bowl of them and soy milk...
After about six months or so of healthy eating, my total cholesterol dropped from over 300 to 176.
If they're too much for you, the regular Trader Joes Cheerio-type cereal are really good as well. Really good sweetened with a touch of honey... it's what my GF usually starts her day with.
You won't ever want to go back to Cheerios after them. Promise.