You have already, a good "gear"(so you said, you are happy with it?)why add anything? If you want to improve something, in the future, start from your source or even get better pre-amp...speakers! You should have less but better, not more and worse! That is just my opinion. Good Luck!
Subwoofer(s) or Digital EQ?
When I listen to well recorded CD's my stereo sytems sounds pretty good. However, most recordings I have were not done to audiophile standards. Many recordings are seriously lacking, especially in the bottom end. My system is all Classe components; CDP-1 CD player into CP-47.5 preamp into (2) CA-150 amps bi-amped into NHT 3.3 speakers (all cables are MIT). I could get a DAC-1 and add a Z-systems RDP-1 and/or an 18" quality subwoofer system (probably Bag End or Velodyne). Any suggestions?