wnat to downgrade my cables

I feel like I have too much $$ in my cabling considering the price of my system. Have all Yamamura M5000 and would rather have the $1000+ I would get used to put towards an amp upgrade and lesser cables. I like the warm sound of the yams. my system is:
Cary CD-308
Cary SLI-80
MM deCapo speakers

Thanks