Aliya (4yrs) has porrige, readybrek, weetabix, shreddies and rice crispies. We occasionally get in a "treat" breakfast, which might be a jordans fruity crunch, or mini weetabix with chocolate chips (my favourite!). When she goes to Nanny and Grandad's, they usually buy her those mini boxes in a selection pack so she can choose one each day. I don't mind as its a very rare occurance.
She's very good at understanding that "treat" cereals are just that, and when they are gone they are gone. In fact, last time I got mini weetabix with chocolate chips, she even allowed me to serve up 1 weetabix, with a few of the mini ones on top so they lasted longer. I guess she understood that she would have them more often that way.