I feel you on only having one 80. Just this week, after 2 years of playing, I have two characters level-capped at the same time. Oddly enough, my first level 80 was not my level 70 in BC. My main is now a Draenei Death Knight [insert Death Knoob comment here]. The idea of a Draenei falling into the Lich King's grasp was immediately an intriguing story line for me. Being of a race that is viewed as such a noble and honorable group within the lore, then becoming something so evil, and then having a chance to redeem himself by setting out to kill the Lich King makes him really fun to play... more so than it would have been for let's say... an Undead Death Knight

I find forsaken Death knights are the most interesting to play, as they are no stranger to the chill of the grave, they live to kill the lich king yet they were taken over by him, it's like the draenai being possessed by an eredar overlord. It doesn't seem like some strange occurance its more fuel for the hatred, if anyone has the right to kill Arthas its a forsaken death knight (main characters not included i.e.: tirion).

The person that inspired me to make my death knight (even though i made a spriest first i always planned to be a death knight) was in part arthas but more the death knights of warcraft 2, which are probably closer to warlocks if you compared them nowadays. They were always my favorite orc unit to spam. The idea of a fresh death knight who is bitter and indifferent to the feeling of death feels very purposeful and cold. They seem very like when arthas was hunting malganis, a mercenary who will stop at nothing to get his own personal vendetta. These are such reasons why i like Maiev who is the reason i enjoy rolling rogues and hunters (as she reminds me of one or the other).