Pretty much, just buy the tomestone gear for each expansion as you unlock it, and that will carry you roughly to X5 for the next expansion. After that, upgrade what you get from dungeons, and you will basically be fine until you reach endgame. At that point, just spend the capped tomestones on your class of choice(if you decide to change from BRD), and just grab whatever to desynth/sell to GC/materials to sell on MB with the other currencies.