Before buying any "Fancy" cables I'd get a decent power supply, my choice would be Plixir but I doubt you'd stump up the cash for one of those.
Secondly get rid of the Laptop and get an inexpensive streamer maybe Emerson Digital or something similar.
Then get some used "Fancy" cables staring with power cables. You'll start to hear which cables need to be changed.
Your system will then start to sound "audiophile" not a flat digital melange.