In reply to Professor Bunsen:
My vote would be a canon 1D mkIII for the same money as a 7D or less than a 70D. Faster FPS, better ergonomics, better view finder, better AF, better image quality as long as the lens has enough reach (a 1.6 crop camera is better if you are focal length deficient but if the lens has enough reach the bigger sensor accounts for more than the extra megapixels), more pliable raw files on account of the better circuitry in a 1D, better weather sealing, far better battery life, subjectively better noise characteristics and less noise overall, better responsiveness and a deeper buffer.
Downsides would be the extra weight, the camera has likely been used by a pro and will have worked for a living, no video, less megapixels (which is really only a problem if you are printing big), slower write speeds to the cards and a worse screen.
The shutter is not silent though but why is that really a problem? The 1D series were built for using teles and will stand up to almost anything you can throw at it. If you do get one, make sure it is outside of the serial numbers where the infamous AF problems occurred or the seller has a receipt the problem has been sorted.