Just a personal point of view :

I don't do dailies, ever.
I like to use flightmaster routes for long distances because I can do something else in the mean time. Epic flyer simply would save me a few seconds between the closest flying point and the entrance of the instance I'm going to : Not worth it.

My advice : gear your tank, buy casters mace for your shamans, power level enchanting on one of the characters, and go practice your heroics ASAP.

If you plan to run dailies for gold, then the epic flyers are probably a good idea.