You should do BOTH if you have the money. If you have budget for only one project, get a GOOD power conditioner FIRST, like the PS Audio's Duet and Quintet.
Mind you that you need quality power cords from the power conditioner to your components, otherwise, it is a waste of your money.
Mind you that you need quality power cords from the power conditioner to your components, otherwise, it is a waste of your money.