Thanks, Brian. I am still deciding just how to set it up, what limitations to place, even how to prioritize it with other projects. Part of what you have helped me accomplish through your comments, though, is how easy it is to end up with variables one has not even thought about.:TI'm sure I don't have to tell you this, but for others not picking up on it, you're comparing DACs and preamp stages in addition to amplifiers here. [Edit: unless, for the Onkyo, you're going into line-level multichannel inputs from the Oppo. Even then, you have the Onkyo's preamp circuit.] There will be those who will say that these things should be as transparent as amplifiers should be, but those who believe that amps can make a difference likely will also believe that the DAC and preamp circuits will also.
That said, I would go with the last option if you have a lot of time to compare. I haven't done a lot of this type of comparing, but it seems to me that if you're looking too hard for differences you may start to make them up in your head :coocoo: