Help me decide. World of Warcraft cl debate.?

I currently play a level 80 arms/fury warrior. I have great gear, Pve is full epic great weps, and my pvp set is even better with full relentless gear. I have been playing this warrior for a long time now, and I'm just getting a little, board with it I think. I started a death knight he is now pvp 80 with bad gear full 5 man reg toc. He's dps sucks! Should I stick with the DK and just change everything up. Just. Side note, I don't like playing two, cles, when I pick a toon he's all I play lol. So dose anyone have any help on making this decision? Should I stick it out with the warrior, do there future look exciting, or should I go death knight?