Not sure what you mean by separates, nothing you posted would be considered such normally. Separates usually refers to a separate pre-amp/processor and separate amp as basis (integrated amps are a combo of pre-amp/amp in same box, receiver adds radio/internet capability in the one box). The Onkyo has audio video capabilities, but an avr would usually offer more flexibility and often at a better price (even if you don't use all the features).
A blu-ray player as transport for all sorts of optical discs is just fine, and more formats are available with digital connections but if you're limited to 2ch audio that may not make much difference to you. If your pre-amp/receiver is analog only then the use of the dac in the player may make more sense, but I prefer digital.
Do you need the video capabilities at all, no plan to use this with a display of some sort?
Welcome to the forums, good luck in your search.