Hmm well my dk name is moocrewa horde azgalor server his gear is mostly raid drops and badge gear and as my main raider toon he's got a pretty high gearscore. Around 5500 ish in his tank gear. I use a frost/blood sub spec, for tanking and also a frost dps spec, if you armory him you should find it I suggest learning how to play your dk solo lol as learning how to play dks as a rule will improve your understanding of the macro and other info I have given