Well, I said something about the talents you always should have...that was not entirely thru... I myself lost Avengers Shield in my build. But a warning... going for only 40 points in the protection tree is only vialable for raiding tankadins.
So what should every Tankadin have?
Improved Righteous Fury 3/3
Shield Specialization 3/3
Blessing of Sanctuary 1/1
One-Handed Weapon specialization 5/5
Sacred Duty 2/2
Holy Shield 1/1
Improved Holy Shield 2/2
Combat Expertise 5/5
5 points in the first tree of retribution
Improved Judgement 1/2
This will give you a 0/40/11-build. leaving 10 points open to put anywhere.
If you are not raiding End-T5/T6, make certain to take Blessings of Kings and Avengers Shield, and make the 5 points in retribution in Benediction.
The other 8 Points should most likely go to Ardent Defender and Precision in my opinion, more survavibilty, and more hits=more threat.
If you are a raiding tankadin, may I suggest the 0/40/21 build? Putting 5 points in Improved Blessing of Might for raid utility. Putting 3 points in Improved Seal of the Crusader (3% more crit for the whole raid), 3 points in Pursuit of Justice, 3 points in Crusade (3& more threat against 95% of all raid bosses) and Sanctity Aura 1/1, which gives about 10% more threat.
Now...Round them up....and Consecrate.