Jeff Rowlands Amp and Dac vs. VAC amp and DAC


Hello, I am new to this forum but I have a question. I am trying to pair an amp + DAC with my Wilson Sabrinas. I have listened to Jeff Rowlands integrated with the Aeris DAC. And the VAC Sigma integrated with the Aeris DAC. Price is a factor and so is space. Does the 625 need a pre-amp? Any suggestions or thoughts? 
rinpoche
Oh, forgot to mention. Your computer could benefit from good power conditioner, not sure about the dac - after all it's Rowland. Also, usb cable from computer to dac matters too. I heard that better Audioquests are pretty good, so should be Purist Audio of course if he makes them. I don't use computer in my system, no first hand knowledge. And the final thing you might eventually want to do, after everything else is in place, are power cords for all components. They don't have to be very expensive, but probably at least $300-$500 for each depending on length.
And this purpose remains unclear. As a philosopher, I am sure you understand it. Good luck with your audio quests.
Thanks.  I appreciate all the fine suggestions. I have one crystal cable power cord from the old set up. And a Transparent usb that seems fine. Otherwise, all is well. 

I must say I don't philosophize about equipment but equipment enables me to philosophize, if that makes sense. 

best wishes to all of you, R
Hi rinpoche;
I was reading this thread initially about sabrina cause i own it then i realised we have the same system.
dev200+sabrina; and i m looking to jump to arc 75gsi; i wanted to ask you how is your journey so far with vac?
havn t you missed dev200?