"Stress" is a red herring.
A test was conducted here a few years back where people received three different cables in the mail. They could listen to them as they pleased before sending them on. No one watching and nothing to cause stress.
No one could tell the difference - the results were the same as chance.
Similar tests have been conducted many times.
The simple fact is that no one can tell the difference between cables if they don't know what they're listening to.
So save a few bucks and get the cheap cables. Why not? This hobby is about getting great sound, not winning a fashion show.