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
Look at Aurender and Bryston digital players. The Aurender N10 is a little pricey. I have the BDP2 and use it to stream Tidal and listen to CDs that I've burned. My friend said the N10 sounds better than the BDP2, but I'm happy with it. 
BDP2 is also very nice... But it does not have on board mass storage.... But I would not be surprised if a hypothetical next Bryston servr will be equipped with mass storage in one form or another. G.   
I appreciate this, but I am not buying a server. At least not now. I have a long usb and that will do for now. I thought you meant did I use a music center like J. River or some such thing. I use MAC so I am actually mostly on itunes and wouldn't mind trying a center like Audirvana. I have Tidal but I am not convinced by the quality of the files. I would love to hear you all weigh in on this. R
rinpoche if you are soliciting opinions on Tidal then I will weigh in as loving it. I think the sound quality is excellent for the most part one thing to keep in mind though is the source they are using, i.e. some are remasters some are not, some were recorded well, some were not. But I think it sounds as good as CD's that I've ripped and stream, and its tough to beat the selection. I listen daily and love it. The one thing Tidal doesn't have yet is high rez, that may or may not be coming down the road.