I honestly think that since we really don't have much information on the artifacts that we should wait on the three main quests.  I say we do one of the side quests first.  Maybe they will give us more information on the main quests or open up an easier way to complete the main quests.  Maybe the Masked Mage is actually an elf from Llyny Vale and can give us key information that would be invaluable for when we go in to get the artifact.  Then again, they may just be fluff.<br/><br/>I think we should do one of the side quests, either Masked Mage or Weepingstone and then depending on what that quest gives us, then go back and revisit which one we do next.