My guess is that with your Apollo-Mira combination, you're having a hard time adjusting to a new level of detail. Your new equipment is not as forgiving as the old Nait and Planet.
I've owned both the Apollo and the Planet -- both are great, but the Planet is more rolled-off. It's not as accurate but with some (many?) CDs, it's easier on the ears.
I've also owned a Rega Mira 3 amp. I never really learned to love it. However, I replaced it with the lesser model in Rega's line, the Brio (the 2000 model, not the current Brio 3) -- and now I'm a lot happier with the sound. The Brio is not as convenient -- no remote control -- but it sounds (to my ears) more musical, less "electronic" than the Mira 3.
The Planet and Brio are in my current office system, driving a pair of Spendor S3/5s, usually at low levels -- very pleasing and musical, often so much so that I get distracted from my work.
So, I'd suggest you look for a used Brio -- if you can live without remote control, it might suit your taste more than the Mira. I'd keep the Apollo -- it partners nicely with the Brio. I'd also suggest you mate Rega with Rega rather than be tempted to mix-and-match Rega and Naim -- some have mixed the brands to their liking, but my experience suggests otherwise. My main system uses Naim (Nait 5i and CD5i) -- I hear audible brand synergy when you keep Naim with Naim and Rega with Rega.
If you do get a Brio but find you don't like it, you can re-sell it -- they rarely last too long on Audiogon.
I've owned both the Apollo and the Planet -- both are great, but the Planet is more rolled-off. It's not as accurate but with some (many?) CDs, it's easier on the ears.
I've also owned a Rega Mira 3 amp. I never really learned to love it. However, I replaced it with the lesser model in Rega's line, the Brio (the 2000 model, not the current Brio 3) -- and now I'm a lot happier with the sound. The Brio is not as convenient -- no remote control -- but it sounds (to my ears) more musical, less "electronic" than the Mira 3.
The Planet and Brio are in my current office system, driving a pair of Spendor S3/5s, usually at low levels -- very pleasing and musical, often so much so that I get distracted from my work.
So, I'd suggest you look for a used Brio -- if you can live without remote control, it might suit your taste more than the Mira. I'd keep the Apollo -- it partners nicely with the Brio. I'd also suggest you mate Rega with Rega rather than be tempted to mix-and-match Rega and Naim -- some have mixed the brands to their liking, but my experience suggests otherwise. My main system uses Naim (Nait 5i and CD5i) -- I hear audible brand synergy when you keep Naim with Naim and Rega with Rega.
If you do get a Brio but find you don't like it, you can re-sell it -- they rarely last too long on Audiogon.