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Take a closer look at the light armor passives...
Light armor for cost reduction on self heal and self buffs is not to be trifled with. Provides you with capped spell resist which will help more than a few points of armor.
You're a DK, use your Spiked Armor for armor and go light armor for all the benefits to taking spell damage which is the major threat with all the AoE going down these days...
Light armor also has better magic resistance than heavy and majortiy of skills are magic damage... also you can just use spiked armor skill to get soft cap... where as it's harder to do with magic resistance.