I'd recommend upgrading DAC/Amp Upgrading USB wires means nothing because digital does not lose quality, it either works or does not. So you can keep that. USB and S/PDIF both have their own little drawbacks, but a converter would probably give you the problems associated with USB at best and...

Whilst going through my grandparents house I found a vintage Sansui 7070 in excellent working condition and some real nice speakers as well. My sweet grandmother was kind enough to let me take it back to my college apartment. :D (Phono in is covered by those plugs and is to the right of GND...