Should Sion build Rylai's

This item is really great on Sion because of the following:
- The 100 AP gives him better poke, more damaging shield, and a tougher shield
- The life is self-explanatory
- It gives his shield an AOE slow so that he can more readily land Q and E
Has anyone tried fitting this into the standard tank sion build? I'm thinking something like this:

or
or
if I want some more damage on Sion.