Common things to reforge onto warrior armor: HCI or DCI, Stamina Increase 10, Damage Eaters.
Common reforging for mage stuff, MR 4, overcapped LMC or LRC or Mana Increase, Damage Eaters.
Most warrior armor is reforged with lower tools to get just 1 property overcap or something that can't be imbued.
Most Mage stuff I think is reforged with the best tools and choose 2 of the mage titles, and just hope for something sexy to wear.