Here's my take on it. If a cable passes the signal unmodified, then it will be the same as any other cable that does that. Several studies have shown that less expensive cables perform just as well as Monster cables. Monoprice.com is a popular choice for members of this forum in terms of affordable and high quality cables. Other members like Blue Jeans Cable, but those are more expensive.
If you can buy the expensive cables from someplace that will take them back without any penalties (e.g. restocking fees), then you can always buy both and do the check for yourself. I'm not being sarcastic - the proof is in the pudding, right? If you can't tell a difference, then the more expensive cables aren't worth the extra cash.