For my own studio I've got a set of Mackie HR824 MK1 nearfields - fantastic speakers, very underrated even with their $2000+ price tag, and hold their weight against the Adams and Genelecs I've put them against. I likely would've gone for the Adam A7's if I hadn't found the Mackies for cheap ($350 because the guy thought they were broken).

I previously had KRK Rokit 5's, and like MountainSide said, they really need a sub. I used to work for a local music shop selling all manner of gear - KRK, Adam, Genelec, Yamaha etc. I personally never "liked" the Yamaha's as they were too bright and a bit harsh, but they were more accurate than some. KRK's get my vote for the lower end price range, and Adam's for the mid to upper end.

Getting to the higher end, the main studio I had access to when I went to school had a matched set of 5 Adam S4X-V's (plus matching sub), and at $5k per speaker and a matched calibrated 5.1 setup they were utterly fantastic. The secondary studio had a 5.1 set of Genelec 1032C's that were also fantastic (2.5k per speaker), but not as accurate as the Adams. And the third studio had a monster pair of Genelecs, like 15" woofers, don't remember what model they were but they didn't sound nearly as good as the other two rooms as they were much too big for the room.

And further, the studio I worked for a couple years ago had a pair of passive Dynaudio M2's that I think above all were my favourite speaker, mostly for the absolute smoothest mids thanks to that monster dome midrange driver. They were absolute heaven.

I work here