I purchased 2 new cereals when I started P2. I, personally, don't eat cereal for breakfast. I'd much rather save my carbs for lunch or dinner. I actually will have a bit of cereal with my lunch every once in a while.
Hot-Old Wessex LTD -100% Whole Grain Cereal
Cold-Food For Life-Ezekiel Sprouted Whole Grain Cereal w/Almonds
It's definitely a learning process to start reading labels, because many companies are doing everything possible to lead us to believe we are eating a healthier product then they are actually providing.
Good luck finding something that works for you.
ETA-I sometimes stash my healthier stuff from my DH who ought to be renamed Capt. Crunch. He eats anything and everything.