Yea drop reckoning completely and one handed weapon specialization in my opinion. Although I am not sure whether the 1h weap spec buffs Hotr or not it helps free up points in the ret tree that are desireable.
http://www.wowarmory.com/character-t...arush&n=Daelak
This is my current spec and I have no problems with off tanking or main tanking any boss in Wotlk. What I did was make a BV set for threat / trash and an avoidance set (currently not seen) for bosses with higher physical damage hits.
Good Luck!