the only thing that sucks is that you also have to be exalted with all the horde factions. I finally finished all the "champion" factions and couldn't figure out why I couldn't buy the heirlooms. Then I realized I needed to also be exalted with all the basic horde factions.
Not sure how much it costs, but I guess I could buy cloth or something, some of them have a long ways to go though

there any easy way to raise basic factions quickly?