Lots of advice, some good some, well pure nonsense.
Price has nothing to do with performance. Learn why something sounds the way it does first then you can make informed decisions.
What transforms one system does not always transform another system. We recently build speakers cables - one system the improvement was probably the biggest improvement I have ever heard from a cable. In our main system there was improvement but no where near the extent of the other system.
Budget Digital Cable - Audio Envy about $150 - better digital cable Jorma MSRP around $1K.
Audio Tekne makes some nice 500 strand Litz copper ICs. Look for them used.
Hapy Listening.