Though these posts usually end up as a confirmation bias for people's own purchases or wishlists, let me add my own to the mix. For some of the best monitor speakers I've ever heard, I went with GR-Research NX-Studio monitors. They have all the detail, tone and texture in music you could ever want, surprisingly play very well with whatever gear you power them with, and respond very well with placement restrictions. You could DIY a set for about $1600, or they are now offered as complete built options for $3K.
Closest to them performance and sound wise is Fritz speakers, but I'd still say they're not quite on the same level to get that air and space soundstage detail that the NX-Studios do so well. Just my humble opinion.
-Lloyd