Actually, after looking over your system again, I think your best bet is an integrated amp. Sell your Parasound PHP850 and the Adcom 545II, look for an Ayre Ax-7e, Plinius 8200, or even a Classe CAP-150 would be better than what you currently have.
Personally, I'd be looking for a tubed integrated amp, but you don't seem to be interested in tubes. At the low end of the market, you will get more bang for the buck sonically with an integrated amp than with separates.