level 60 rotation for DRK?

Use Plunge and Sole Survivor on cooldown. In single target, watch your MP so you have at least enough for Dark Arts + Carve & Spit. In AoE (3+ targets) it's mostly handy to use it as is for the MP you can then use on Abyssal Drain. If you see a dying mob and Sole Survivor is up, use it on that one for an extra bonus of MP/HP.

Use Dark Arts so that you don't cap your mana- don't worry so much about what weaponskill you buff; they all add +140 potency (with the exception of Carve & Spit, which is why you always pair Dark Arts with it). When there are two or more targets, always use Dark Arts + Dark Passenger.

If you're wondering about level 70, it stays roughly the same, however I would advise to try to balance around 4800 MP (2400 for Carve & Spit, and another 2400 for The Blackest Night should you need it). Lastly, try not to cap on your blood gauge, and use Delirium whenever you have Blood Weapon (Or Blood Price, of course) active.