I have 603's at home, and I like them, you can tune the LF roll off by plugging the port with various grades of foam they provide...very technical.
I use B&W at work, and you do need to have the room right and place them as per the manual. They are great but you might need something with tweak ability in them..PMC' of some description with active crossovers for instance. Depends on your budget.
By all means get some, and more importantly get used to them in your room...Full range and flat, whilst desirable, never really happens. No room is dead flat, And you can't hear the full range of 16Hz to 35kHz speakers. Your ears, your familiarity with you room and your speakers character are far more important.
Sorry, monitors, not speakers.
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Abbey Road Studios