Did you realise I had forgotten this one? Now for the shortest list ever.
1. Libram of Valiance – 25 Emblems of Triumph
As you level you should be able to grab Venture Co. Libram of Retribution (minimum level 74), for 30 Venture Coins. This is a silly currency used for some PvP objectives in Grizzly Hills which are always deserted on my server. You get them from doing a few quests. Its very easy to get 30. As soon as you ding 80 start pumping out the heroic dailies until you have 25 Emblems of Triumph and then buy the Libram of Valiance. You should easily get these before you have Emblems of Conquest you no longer need. I know there are other items, but this libram is incredibly good and a vast improvement on the (terrible) Emblem of Heroism and the (average) Emblem of Valor/Conquest ones.