Best Audio quality in Home Theatre Reciever? DVD ?

I am attempting to assemble a home theatre system--I am using mostly older Castle Inversions for front and rear (also have Castle Centers (really loved them upon release) but am clueless about the rest of the system. I am not happy with anything I have listened to from Onkyo, Pioneer, Denon--granted, I would not purchase any of their products for audio in general, however this has been pushed in my direction--most of the Digital stuff is hollow, or really grating---

I love the warmth of sound I get from my Marantz 2325, Inversions, Cal Audio CL 15 and Oracle turntable--Can I get great sound from any equipment on the market, new or used that you can knowingly recommend and tie this into my Pioneer Elite Plasma (sitting in it's box)--???