What about the F-15SE? It has internal weapons carriage like the F-22, its not a start from scratch frame which means less costs and boeing has footed most of the R&D bill already, and not forgetting that it is atried and tested platform already.
The arguement it is an old frame does not cut it really, the Super hornet is just a class of its own compared to the hornet, so why not the Eagle? Besides, a frame can be a hundred years old but if it still does the job effectively why should it be dropped? We still have the B-52s roaming around don't we?