I personally believe that there is absolutely nothing wrong with a whole grain cereal, as long as it's not ruined by insane amounts of sugar.
My recommendations are Cheerios, Shredded Wheat, and some sort of bran flakes, as long as the bran isn't too abrasive for your GI tract. Be careful with raisin bran, though; depending on the brand, it can contain high fructose corn syrup and other added sugar. Although the fiber slows the sugar absorption, I just feel that so much added sugar is really unnecessary. The raisins are enough.
I'm not a big fan of Special K because (1) it's mostly rice, (2) the germ is removed from the wheat so they can call it fat free, and (2) I feel like I am eating air. I was a big fan of Kix as a kid but don't eat it anymore. I'm not sure of its ingredients or nutrition facts.
Like I said, go for the whole grain, not corn- or rice-based stuff.