I am eating wheat-free, but for a while I was gluten-free too (didn't find it helped), during which time I ate Bob's Red Mill Gluten Free Mighty Tasty Hot Cereal for breakfast. It's like oatmeal and it's pretty good. Like you, I need something pretty filling for breakfast, Rice Krispies would not cut it for me.
-------------------- IBS-C, lots of spasm and trapped gas.