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
There is used Rowland Continuum S2 on Audiogon for about $6000. He might ship to Canada. Question is if this is good enough.
I love the 625 S2 so that is what this is all about. Making sure this is where I want to be. The goal is to be happy. I don't know if you have heard the Vac 200, it is lovely. But for me it is the amount of time it is in use (given it is also for my work) and the playing around with tubes. The JR is lovely. I am in the final stretch now. Thank you all. 

In my opinion, Sarah singing Angel with Emmylou Harris is a great track. One of my all time favourite go-to songs. 
Not really the same direction, I prefer Loreena McKennitt. She is a Canadian, by the way. The concert in Alhambra, Spain is excellent.
I love Loreena too. Yes, they are both Canadian. 
As for the Continuum, I heard it and passed. I think (at least to my ears) the 625 is better. And down the road I can add a pre-amp. Thanks you for letting me know. Wilson likes JR with the Sabrinas too. Could it be I have decided?????