well firstly PLEASE don't use icy chill, it's proc rate is horrendous and earthbind should be all the slow you need, If u think icy is going to help u catch a hunter you are mental.
Then please consider that vs every other melee class ( some exceptions e.g. ret paladin) you will be forced into kiting them meaning that crusader will not be proccing. This means that you will miss out on spell power ( 55% of AP = enh SP). SP ofc needed for shocks, lightning shield and searing totem.
furthermore crusader in an OH weapon will very rarely proc even with lava lash.
agility provides constant AP, SP, crit and dodge and this far outways the benefits of crusader.
By all means try it out in your main hand but if i were you i wouldn't waste your money.