More diversity for Tank Support items

Ok I play a lot of tank support; tanks are very much in the meta right now. What I'm seeing is that regardless of which tank you play, you pretty much always build the same items. Start Relic Shield, and preference between potions and ward. Once you have 800 gold if it's safe to recall (or you die) get your Sightstone. If you can stay until 1300 gold get Sghtstone and upgrade to Targon's Brace.

Full build is going to be Face of the Mountain, Boots (likely Merc's or Mobility), Frozen Heart, either Spirit Visage or Locket of the Iron Solari, and likely a Warmog's, if you even get to that point. That leaves 1 item slot to play with.

Traditional supports have all sorts of situational options. Two traditional supports are going to have very different builds. Soraka wants different things than Janna; Janna isn't going to build the same things as Karma, etc. As an example, I'd love to build Leona differently from Braum.