See my system below... I want good CD sound, and I want pretty good DVD sound. In other words, I think it would make sense to spend a little more on the RCA cables than an optical digital cable for the DVD player. How good of cables should I buy? Also, I have a monster Y connecter, pretty good .5meter monster cable and gold plated radio shack 1/4" adapters to connect the sub to the receiver. I use decently sized monster speaker cable to all my speakers.