The Usher's are an easy recommendation. I had a customer trade in a pair of the B&W 802D for the Usher and he is extermely pleased.
The Usher's throw a huge soundstage and are very transparent without being bright. They will suit whatever type of music you throuw at them and they will play quite loudly. The question of how loud is up to you. Studio monitors like ATC are accurate but will probably sound quite boring and uninvolving to you. A speaker like the Usher with a good subwoofer will really do the trick for you. Not that they need the bass reinforcement, but a good subwoofer will propel them into sounding really amazing!