I recently purchased a Marantz SR6015. This is huge upgrade compared to the rest of my budget system. I currently have a Sony DVP S530D (CD/DVD) and Sony BDPS1700 (Blu Ray). I just bought a toslink cable which I now understand turns my cd player into a transport and uses the DAC in the SR6015. I have on order the Marantz CD6007. But now I'm wondering with the DAC in the AVR what does the 6007 give me that makes the upgrade worthwhile? Should I look at something else?