When it comes to DACs and amps its just simple: get the one that has the best signal to noise ratio. Usually they should not alter the sound profile at all.
Also most DACs you will find on audiosciencereview for example have such a good signal to noise ratio (>100 or whatever) that is is imperceptible to the human ear anyway. You can go higher, but you won't hear a difference. And some of these cost less then 100$ or even less.
I would go for something that looks ok, is not too large and fulfills your user experience preferences.
In my example I bought separate DAC and AMP to have the best signal to noise ratio, but I have more cables and 2 boxes on the desk and the AMP is huge. I would rather go back for an integrated solution that maybe can also drive my monitors. But here we are...
it's not all about perfect measurements.
then, of course, if you buy into all the snake oil it's a different story ;-)