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the 5d mk3 is a bunch of rumors at the moment and it might be another year before launch and soon after there will be rumors of a mk 4
i would concentrate on whats available today
the 5 dmk1 makes a great portrait / landscape camera and does a fair attempt at everything else
the 7d makes a great sports / wildlife camera and is no slouch when it comes to portrait / landscapes
the 5d offers a wider angle of view and if thats important thats the camera to choose
the 7d offers the latest technology with better focusing abilities and faster frame rates but the same angle of view you already have with the 450d
the 7d also does video if thats important
i think the choice boils down to what the camera is going to be used for the most
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