As others have said, chest and shoulders until 80. Trinkets get replaced pretty quickly after entering WOTLK content, as there are better ones. Weapon(s) it really depends, you can pretty easily get blue items in WOTLK through quests or dungeons that rivel the BoA and grant stats they dont have, plus there are some really, really cheap enchants that you can get on blue items at that level. On my DK I replaced the BoA axe the second I hit 70, as Rune of the Fallen Crusader is better then anything you could possibly enchant on it.