The RSX-1058 has an Analog Bypass mode that will bypass all delay, bass management, and d/a conversion. I use it and it sounds great with my B&W speakers. The only thing the RX-1052 would give you is slightly more power. But the 1058 will power the CM1s with no problem at all. I use a 1057 in a similar setup with great results. The 1058 adds HDMI Audio and video scaling which I won't use anyway.
Others may chime in, but I'd consider the following:
RCD-1072 - Use the analog outs on this to the CD input on the 1058 and set the "bypass mode" and "analog" input in the setup menus (going off memory here). This way if you do play HDCD you get the advantage of the DAC in the 1072. You can try the digital out and use the 1058 do decode, you be the judge of what sounds better.
Blu-Ray - Use the 5.1 outs on this unit to the multi-input on the 1058. I believe you can do bass management on this input, but it also has a bypass mode. You MAY be able to get the HD Audio decoded on the 1058 over HDMI, not sure about that though.
DVD - Just connect to TOSLINK or Coaxial and set it up in the menus.
TV - You can run your digital out of your TV to the 1058 for DD audio on OTA broadcasts
I think this unit has 7 or 8 inputs, and can do 7.1 However it only has a 5 channel amp. If you want to do 7, you get a 2ch amp, and setup the front pre-outs to that amp, then the 5 channels in the receiver power everything else.
So in my opinion not sure why you'd keep the Onkyo or get the RX1052. I do not think the RX1052 can act as an "amp" so you'd effectively have 2 volume controls; 1 for the fronts and 1 for everything else. I guess it could work but just seems overly complicated.
I think the 1058 will drive your "plain unprocessed" audio fine. It will also do great as the AV receiver. Like I said, I've used a 1057 for a while now in a very similar way and it's a great receiver. It doesn't have all the bells and whistles of the Onkyo, but you decide if you NEED them.