I’m thinking of getting a Conrad Johnson preamp and calling it a day. At least that preamp should grow with me if I decide to go with some other posters suggestions of going with the brighter Monitor Audio.
That’s not a good idea if you’re looking for the level of detail your headphones produce. The Monitor Audio speakers aren’t bright per se — like your headphones they’re neutral and detailed and not bright (which is precisely why I recommended them) unless you pair them with bright/shrill electronics. The CJ preamp will squelch the exact detail you’re craving, and paired with the already warm-sounding Parasound is just going further in the wrong direction IMHO. The simplest thing would be to sell the Parasound and buy something like a Hegel integrated. You bought the wrong amp for the sound profile you’re looking for, so better to just accept that and move on than just make more mistakes around it and make things worse. I’m not familiar with your Maggies, but if they’re not capable of producing the level of detail you’re looking for with more neutral electronics than they should go too otherwise you’ll just never achieve what you’re looking for and never be completely happy.