If you're looking for value and performance combined, look into the new Synergistic Research Pink AC Power Cables, which run only $198. In my experience they easily outperform most competitor cables up to $800 or so and compete alongside $1K cables.
The reasons for exceptional value are two-fold: first, they utilize the latest shielding and passive EMI reduction innovations from Synergistic Research. The shielding itself is identical to what is used in their flagship SRX XL cable series, which allows for an incredibly low noise floor without inhibiting the signal. Second, the cables are machine-made, unlike all their other cables, which are hand-built, and they are only available in 5ft lengths with 15A connectors. This configuration allows them to reduce the variables and keep the costs very low.
While they utilize 14AWG conductors and aren't considered a high current cable, I've already sold a few to people who are using them for their amps. I would say that for amps, it's a case-by-case basis, but for just about everything else, these cables are a no-brainer unless you are already in the camp of heavily investing into your system.
I am an authorized SR dealer, so take as you will, but I've been a dealer for them for two years and an enthusiastic user of their products for ten years. I wholeheartedly advocate for these given their cost of entry.

