Buy used is the first thing.
I currently have two systems. One has AQ Rocket 88 speaker wires and the other has some 30 year old silver coated, copper 12 gauge wire. I have switched them several times and can always tell there’s a difference.
Wires can effect your sound, so see if you can try before you buy or try someplace like the cable company. They have cables you can try before you buy.
All the best.
JD