Had Robert not been available who would Cersei have married?

[The hairy bear]

I feel some of the suggestions proposed in this thread don't take into account the age gaps. Cersei married when she was 18, and that's about the age most Westerosi ladies seem to marry. At this point, Edmure was 11, Wylas was 9, Renly was 6, and Lancel was 2. IMHO, all of them are too young to be seriously considered for marrying Cersei.