Perhaps you could try some organic cornflakes? If you get the ones sold from a health food shop that are organic they have either far less salt and sugar or none at all, and it means that you have another option for cereal without the salt and sugar worries.

I would second the porridge - but with my DD we make it a bit more attractive for her by adding some stewed pears stirred through and/or a little dab of honey. Perhaps this might be a way to encourage her to try porridge again? Perhaps you could try a little bit of honey on the weetbix to see if she might like that too?

HTH