Basic 12g copper speaker cables to $$$ cables.

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.  

Thanks for the help. What I know about cables could fit into A thimble, at least as far as actual experience goes Like everyone else, I can read about them online. 

OP it has NEVER been about dollar amount. It is about the construct used and how they were put together. There is NO SUPER duper change because of price.. There is however a correlation between a good business model that gives you more each time you pay more.

Me I jump to the position I like in sound, and have for quite some time. Speaker and gear type, really don’t change for me.. Just like the rooms I use.. The cables I build would be tough to better for what they do.. I don’t care who makes the cables... I have had some serious cables over here for 2 to three weeks at a time to be fair off and on for 4-5 years now.. It is tough to beat some of the weaves, and helical builds, with just a little effort and a few good parts.. YES some are pretty spendy. ALL under 500.00 usd, No matter what I do.. Pure silver $$$$

I’ve built cables for 45 years for HEAVY equipment.. this stuff is pretty easy to figure out.. It’s A Cable for God sakes.. Not made by cable gods.. just stiffs like me... with good parts.. I’m a happy fellow..

If was gonna spend money on cables, I use the business model I posted. The more you pay the more you get...That is what most of us want anyway.. RIGHT?

Regards..

So here’s what I have. Maybe someone could offer specific low, mid, and high budget good matches. I know even less about interconnect cables, so I’m open to hearing about the difference they can make and what someone might recommend as well. I have a musical fidelity a308 amp going into ATCSCM 40 V2s. It’s a very complex, difficult room, with no options to change that part of the equation.Any ideas?

I’ve been all the over the spectrum with cables, including a $14,000 loom of Nordost Frey 2 with the QX4 and QB8 etc. In my opinion cables are the last 10 percent that can really increase your connection to the music. They don’t need to cost as much as a car, but if someone tells you they don’t matter, get advise elsewhere.
The first indication of a cable change for me comes from background listening over the day. Little things that get your attention, or not. Give them time don’t just cycle through them like socks.
I’d say $8k system, start with $1k if you can. If you can get a set priced right you might be out $50 if you resell. Maybe you are satisfied maybe not, but that's what I would suggest.  More money doesn't always mean better, but it typically does IMO.