@SarahGen-- My son eats infant rice cereal too. I get the organic kind because I think that's safer and healthier. Also, you can find infant rice cereals with or without added iron. I think the one with iron is better but you might want to ask your doctor first. Sometimes, iron enriched infant cereals can cause constipation in some infants. My son has never had this problem, but if your doctor already has this problem, ask your doctor for a specific recommendation.
Otherwise, any organic brand should be fine.