Okay, I think after some digging and from some recommendations on here (thank you to @yyzsantabarbara for a great place to start, you made things a lot easier.) I think I am settling towards saving a bit more and going for:
A Kef LS50 Meta and a Hegel H95. I see endless debate about this being enough to power it, but from what I have read, it seems it would be. And I can always sell upgrade the Hegel in the future, which would pave the way for an upgrade for the speaker. I like the idea of not putting all of my eggs into one basket with a powered speaker.
I have read some say that the Kef needs a subwoofer to get the full range for classical music, and so I think a KC62 will be the the next upgrade for that, but it sure is expensive. Now I have seen some say that there the Kef LS50 is "basically worthless" for Classical without a subwoofer, but I think this is an exaggeration (and that seems common on these forums!) and I gather that although I might lose a bit of bass from my Audio Engine A5+, the bass will be more distinctive, and I should notice a fairly large difference even without the subwoofer.
What do people think of this solution? Am I missing a piece of the puzzle? The price of the Hegel and the Kef would be around $3000 (I think I can find the Hegel for $500 cheaper), does anyone have a strong opinion on there being a better complete solution for that price?