Looks like a nice plan. the 1-70 grind should be fairly quick and you wouldnt have to spend more than or two in any zone. I like how you hit Northrend, Gear up a bit then go back and hit some 70 heroics. I would make the northrend dailies part of your run. They go so fast and provide a good chunk of xp for little time and it will help a lot when the leveling slows down and your stuck with all the crappy collection quests northrend does.