I listened to the Rega Apollo, Dac, Brio-R, and both the RS3 and RS5 today.
The RS5 definitely packed more of a punch at the low end. And when you turn the volume up, the bass became quite overwhelming in the modest sized demo room. I don't say that as purely a criticism however, as those who like or need (for their room size) a lot of bass output, will probably find the RS5 the more preferable speaker. But given the room I'll be using, the RS3 seemed enough for my needs as it had a more balanced bass (for the room) and it could be played at higher volumes with the bass kept under control.
Apart from the low end, I didn't think there was much of a difference between the two speakers.
I'd definitely describe this system to be on the warm side, which I felt a little disappointed in. It just seemed something was missing. Near the end of the session, the guy pointed out that the DAC wasn't plugged in (I was under the impression it was). Unfortunately, I only had the time to listen to one song at that point. So after just hearing Radiohead's 'The Tourist', I said I'll listen to that one with the DAC. However, he insisted was listen to it again without the DAC and then with the DAC (hooked up to the Apollo). That was perfectly fine with me. Well, the missing part had been found. The song sounded smoother and more cohesive. I praise the DAC with some reservation however, as I only used it with one song, although it's a song I know very well. The employee thought the song sounded more open and airy with the DAC; more light reverb with the plucking of the guitar strings.
So, as it stands, the RS3 is very high on my list, as well as the DAC. The Brio-R is certainly a very good amp, but I'm considering that Cyrus VS2 to help the sound lose a little warmth. I'm not sure.. First, I cannot demo the Cyrus so it'd be a blind buy, which is damn risky. And second, I wish I heard more of the Rega sound with the DAC because the sound from that last song was pretty hard to fault, which might mean the entire Rega setup is what I'm looking for.
Edit: I forgot to say, the DAC also added very noticeably bass; in fact it was quite a nice extension. I'd say with the DAC, the bass was between the RS3 minus the DAC and the RS5. Despite the above, I was pretty pleased with this extra.