If you have cables now that work, then stick with that. The cable can not improve the pq beyond the removal of sparkles, drop outs, etc. If you have those, then the cable needs to be replaced. If you feel a need to push the HDMI 2.1 option sets then replace the cable(s) with ones that have at least been tested for the HDMI 2.0/2.1 option sets or are certified for this. HDMI 2.0 cables are Premium High Speed (if certified) and HDMI 2.1 are Ultra High Speed HDMI (if certified). The use of the HDMI version numbers is discouraged by HDMI.org, especially now that they have deemed "HDMI 2.0 dead" as far as cable descriptions go.
Cable prices are not an indicator of cable quality (AudioQuest, Monster are example) per se. A cable that Monoprice, Blue Jeans, etc sells can, and quite often does, perform as well as the higher priced ones do. Just look at what your current HDMI options are now, what you may want/need in the future, your cable length, and installation. Then choose a cable that meet those criteria. And make sure you have easy access to your cabling for future updates, replacement, etc.