@mgattmch I think stay with the C52 as long as you can. I had C2600 and listened to the C2700 and the DAC module was the primary difference. And the DAC wasn't the key value for the unit to me...it was a it's function as a preamp with a phono stage.
The C52 is a good unit - wait for a step change upgrade and I expect your C52 will be easy to sell with good resale.
Enjoy your system!