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
As a previous owner of Wilson Sophia 2s, 3s, and Sasha 1s, I submit much of the hatred of Wilson is due to "some extent" of Wilson owners. Many, but not all Wilson owners really exhibit the classic clique mentality(they really don't like the thought of someone not liking Wilson's). At one time I defended Wilson Speakers and would argue with anyone who disagreed, I don't own them any more, but I respect their dynamic ability. Just my thoughts.
rinpoche,
Your say you aren't an audiophile but you love listening to music,  I'd strongly advise you to keep that perspective and mindset. Just approach choosing audio gear as a means to enjoying music.  This keeps it simple and honest. Choose the products that move you the most emotionally. Don't worry at all about product bashing, it is just personal opinion and nothing else.  Trust your ears and taste, there are no audio  products that generate 100% consensus ever! 

Tube preamp with SS amplifier is a popular choice and can be terrific but it isn't the same as a tube power amplifier. I'm not saying one is inherently better than the other,  just that they aren't the same listening experience. As you listen to more components and speakers you'll find out what you are drawn to. I believe that you'll be fine. 
Charles, 

Also, waiting to hear some suggestions for amp/pre-amp pairings? If this is a viable alternative to the VAC integrated + DAC and the Rowland DAC and 625 in the same price range. 
Rinpoche, to a some extent price is not an indicator of quality.  Both the VAC and the Rowlands are truly premium quality products that charge premium prices.  I'm not going to argue that you could match or exceed their sound quality at a substantially lower price, but I do argue that you can achieve the sound qualities you desire at a lower price.  You would have to do a side by side comparison to uncover the "lesser" components and fortunately long term happiness doesn't involve side by side comparisons.

Specifically, both Rowland and Ayre make integrated solid state amps in the $10k area.  Pass, Hegel and BAT make solid state power amps in the $5-8k range.  RAM makes a wonderful tube power amp at $5k.  Grace, Mytek, Esoteric (Teac), MSB and Bricasti make great quality DACs that can all be used as preamps at a lower cost than the Rowland.

These are my opinions, so take them for what they are.  From you post it sounds like you have good ears -- ultimately you should trust them.