Canon 50D
Nikon D90 looks pretty impressive, this could hurt Canon more than Sony
If there is any new camera that could challenge Canon 50D sales, the D90 seems to be a camera capable of doing so. Similarly spec'd, and about the same price as the A700 currently, at about $1,299.99.
Photokina is going to be very interesting for both Nikon and Canon, and Sony too.

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