House or Apartment?
In a house you own I would add dedicated circuits first, with good cryod AC outlets. Next I would consider interconnects and speaker cables. I have heard Hydra dealers say the if you add a Hydra, the power cable addition is not as important however I never tested that theory out. Next I would consider the addition of a Hydra or some other brand of power conditioner; there are many good brands of everything out there.