The int talent is pretty much 5 wasted talent points, consider how much extra max mana that really gives you. There's your 5 points for reckoning right there. Having said that, why 5/5 Devo Aura? It's pretty unlikely you'll ever be running it right? You should be having Retribution Aura running if you're tanking. So switch those 5 points from Imp Devo Aura into 5/5 1-H Specialization. Read the tooltip carefully -- it increases ALL damage done while a 1-H weapon is increased. This is a strict 5% increase in your threat, so you really want to have this.
The points in Ret are fine, although you may want to either drop 2 points in Stoicism or Guardian's Favor to pick up Improved Judgement.
My paladin runs with a typical 49/12 cookie cutter spec which works extremely well for 5 mans and Karazhan. That would be the following build:
Talent Calculator - World of Warcraft