Tube Amp for Coda 8 Part 2

Thank you to all for your suggestions in my recent thread. 

I’d like to t take this query one step further. I have a DAC that has pre-amp capabilities. It’s to my understanding that having a pre-amp (analogue) will sound better than digital attenuation. The DAC as a pre-amp sounds pretty darn good, so I am wondering, do I need such an elaborate pre-amp (as a volume control)          or should I just stick with the DAC and save some coin?

Thanks!