I have the apollo and whilst my Rega Mira3 amp was at the menders borrowed at nait5i for a few weeks. Sounds very nice BUT when I got the mira back and did some proper comparisons the mira won hands down, more detail, better imaging, deeper more controlled bass and not quite as bright as the nait. Many slate the Mira but with the apollo and r5s its s tunner imo. That was with my Rega r5 speakers which sound very different to the Monitor Audio. I went in to test the MARS6s with intention of buying, heard the r5s with the apollo and mira3 and again blew the rs6s out of the water. Obviously its down to taste, I listen to a lot of unplugged, jazz, classic, chill out and mainstream pop. As Igg said, make sure you test I think the Nait will be far to bright with thr rs6s regardless of cd. Be interested to hear what you end up with.