Well, if this is for looks (because it's shiny), go for for Sylveon or Umbreon, they look the best shiny.
If this is for competitive battling, I would suggest using another Eevee, because the only physically Defensive Eeveelution with high SpA is Glaceon (Glaceon fits perfectly for your Eevee, both in nature and IVs), and Glaceon is just not a good competitive Pokemon (unless you're playing NU).
So to just answer your question, Glaceon.