If you can afford it, I suggest you audition ATC 50's or higher. ATC's are typically used in studios where engineers spend long hours criticaly listening to music...many musicians/artists such as Tom Petty and classical composers such as Hans Zimmer buy ATC too....as well as Holywood film sound track studios. These are all people with demanding tastes, who can afford most anything out there, and who listen to an awful lot of music a lot of the time.
They are not cheap: A significant investment for a studio, concert hall (Disney for example) or an individual, and an investment that buyers do not expect to have to change for many many years.
ATC rarely, if ever, advertise in audio magazines and rely entirely on word of mouth in professional circles for sales. Studios tend to buy mostly new gear and since ATC is not a household name to consumers, there is not a huge resale market. None of this is a problem if, like most ATC users, you intend to hang on to them for life.