first, never ever let a DK go to town on your priest, that's why you have death grip and hungering cold..

Keep your DKs away from your priest when fighting melee. you have 4x more things to slow him than him you.

it doesn't come down to gear, it ALWAYS comes down to skill, and skill will always trump gear. doesn't matter what you are wearing, you have better combined gear than him, and he had more skill. you will get better at running your team in ways that are not so point-and-shoot