If you're looking for a pair of monitors to only do critical listening of other components in the system, I suggest giving a pair of Amphion One 18 with one of their matching amps a listen.
I did some mixing on a pair of these and while I'd never want to own a pair just for listening, they are audio microscopes.
They've been the FOTM for mix engineers for a year or two and the internet is packing with raves.
You can pick up a pair for around $3k USD and the matching amp is $1500 IIRC.
When you get into this realm, don't buy without hearing them!
Like I said, they were amazing to do a mix on but personally, I hate them.
http://www.amphion.fi/en/create/products/one18/