I preface my post with a disclaimer. I am merely a retail customer of Sean‘s but
@Ciggavelli to my mind the cheapest way to get a better DAC than your current DC4 Dave might be to do what I now have inside the Dave which is the new just released Dave Cap Board from Sean Jacobs. In my system it has made a significant upgrade to sound quality and more importantly it has increased the shear listening pleasure. The idea for SJ to try a cap board with the Dave was first suggested to him by
@marcmccalmont of this parish and what a good idea it has turned out to be.
I first bought the SJ DC3 for the Dave and then his DC4 and finally the ARC6 so as a long term customer SJ asked if I would like to listen to the final options on his short list for the make of capacitors he was going to use. The surprise to me was how much of a sound difference there was between these different manufacturers caps. The AudioNote Kaisei ones he finally selected were the clear winners to my ears and also to Sean's ears. Sean told me that his board was originally intended to mitigate the effect of different lengths of umbilical cable but I only have short (14 inch) umbilicals and yet the the whole character of the sound has got better with the new Dave Cap Board so it might be worth you looking at this route.