My advice for you:

-quest in Terrokar until 64
-Go to Nagrand, Quest there until 66 or 67ish
-Run Some instances for much of lvl 67, and ding 68.
-Do BEM quests until 69, or even stick it out till 70.
-If you're not 70 from BEM, do a FEW quests in Netherstorm. This way you'll ding 70 with all quests in SMV and most quests in Netherstorm to do for gold.

this is my current plan, and I'm at 66.25-ish