I agree with some of the responses above that you might want to try to fix the "basics" 1st before spending big $$$ on component upgrades. I will also start with simple tweaks (if you have not done this already) for eg: clean all cable contacts with a good contact cleaner (Caig ProGold and DeOxit or Kontak) and then enhance it with Walker SST. My experience is after doing this, it is equal to a component upgrade. The music just opens up and became fuller minus the glare associated with digital playback. For approx. $100 it was money very well spend IMO.
Good luck.
Good luck.