I get quite dramatic differences in sound reproduction with different companies and price points. I have come to believe that Power Cables are as important as anything, even on kit you might not expect to respond. I was frankly astonished at the effect of a Lessloss Origonal cable on the Power Supply of my TW Accustic Raven one turntable, having expected little or no difference.
What brands and price points, well I am afraid that depends on your system and ears and it really comes down to "suck it and see". A big plus here is the second hand market, I never by new if possible. Used cable cable is usually at a good discount and the origonal owner has kindly burnt it in for you, plus performance should be 100%, unless the cable has been seriously abused.
Currently, I have found that Lessloss, Sablon audio, Silnote and Wywires , give pretty good performance for their cost. No coincidence I think, that they all small companies relying on shows and word of mouth, not hefty marketing budgets.
As to price points, well that of course depends on your system cost. It seems pretty stupid to connect $1000 components with $1000 interconnects. Having said that, I like many of you I am sure, have heard quite modest systems, can be made to sound fantastic, with expensive accessories, so whose to know? The old rule of 10% of total budget to be spent on cable, is pretty sensible, if not followed slavishly.
