DAC suggestion for PC

Need some help deciding on which DAC to use with a few changes I will be making for my PC audio setup. Currently I am using a iFi Audio Zen DAC v2 connected by USB (and a Fosi Audio Tube amp). Right now I am using some PSB Image bookshelves (but I'll be changing these as well) and a Velodyne Subwoofer. 

The change I will be making, is I'm looking at changing my amp to a used Cambridge Audio CXA61 which has its own DAC. The Cambridge has the ESS Sabre ES9010 DAC model. If this isn't a better DAC, then I'll look at the Cambridge Audio AXR85 instead which doesnt come with a DAC instead and keep the zen dac.

My questions are the following:

1. Is the CXA61 dac better than the Zen DAC v2? It would be nice to eliminate an extra piece of equipment.

2. Might be a bit out of my budget, but how much of an upgrade would the CXA81 with the ESS Sabre ES9016 DAC be? Is it worth paying the extra?

From what I understand, the model of the DAC alone doesnt tell the whole story, but how the unit is built and setup around it that also matters. Hence why I am looking for some feedback as Ive never compared or auditioned them with an A/B comparison. Thanks