It's a reasonable question, but IMO it's impossible to answer. It all depends on system synergy and your taste. I have two different sets of speakers. With one speaker - same room and system, I prefer my $100 Belden cables to a set of $1500 cables from another company. With the other speaker, the Beldens are impossible to listen to and the more expensive cables are worth every cent in the amount of improvement they render. I think it's always a good idea to start with ordinary decent copper cables to get a baseline. You should list your system and the members here may be able to give you some good recommendations. You should also try to state what you are trying to achieve as an upgrade and they type of music you listen to. I know - you listen to "everything". Everybody but me does too. So maybe just what you listen to the most will suffice.
Basic 12g copper speaker cables to $$$ cables.
How much do you have to spend to hear a difference? In other words, is an $80 upgrade worth bothering with? $200? $800? Etc. Let's say we're talking about an 8K system, with speakers as the best component.