I vote for DIY PC, easy, fun and cheap or very moderate cost and I believe they can make a difference but if not still a fun project. I also believe once past a certain point it is not likely to make much of a difference, just cost a lot more and might make a change that fits ones taste more but not really an improvement unless you like and difference in how they sound, if they do so.
I feel the same for all cables and been making my own for a very long time.
If not into DIY there are great low to moderate cost cables as mentioned here already.
Rick
Retired USN tech and very high end sound quality car audio competitor that made all my own cables and used welding cable for the power ones as well as turned down full sponsorships for what I considered snake oil cables.