I don't see a problem going to Northrend at 68. I hit 80 with no quests done in Storm Peaks or Icecrown. I also had zero rested experience since I leveled to 80 in less than a week. If you do go at 68, You should definitely do both Howling Fjord and Borean Tundra.
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“It is better to be rich and healthy than poor and sick” - Dave Barry
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