I would look for used, typically available for half the original price. Pay attention to their purpose / construction. High current models are for amps… highly isolated noise reduction are for components. It is best to try before you buy.
I would look at mainstream brands. They have long track records and you can be sure of getting well thought out technology designed to make a difference that is highly reviewed. I recommend looking at AudioQuest, Transparent, Cardas, and DHLabs. AudioQuest Storm series has been a real leap forward in performance for that company. You can expect lower noise floors, usually more detail, and more dynamic presentation with good quality power cords from these companies. But as with all wires associated with audio equipment it will depend on your components and system as to the degree of improvement you will get and under certain circumstances they could sound worse. This has happened to me with not very good sounding solid state equipment. Adding higher resolution power cords to a noisy and/or distorted sounding component will make your system sound worse. In this case I highly recommend low cost Cardas as they are designed to be warm and forgiving.
I use Transparent power cords on all components of my main system except the amp where I use an AudioQuest Hurricane and a combination of WireWorld and DHLabs on my other systems. I have found the lower tier Shunyata, Cardas, WireWorld and some others to provide little or no improvement.. although most of my components come with very good quality power cords… although they are clearly bested by mid-range and better aftermarket power cords.
For some reason I am completely in the dark as to why, the same brand and level of power cord seems to have the same effect as the interconnect.
