D800
Hi Hamish, you still do not need 36MP for big shots, one of our customers did full billboard size prints from the original Canon 1Ds camera with no problems as remember they are not printing at 1400DPI like on an Epson printer but are big circles of colour when you get up close, it realy is down to the viewing distance as well.
I am not convinced at the pixel end that it does much good, better to invest in as good glass as you can afford, much better in the long run, infact a Hasselblad employee said to us he can not see it being that good as there was a very good reason why they have stopped at 60MP for their camera, the current range of lenses can not deliver the resolution required to take advantage of the sensor & there camera has a much bigger sensor.
It looks like these days the camera companies are producing stuff just to sell & then it seems these days it does not work properly upon release ( see Canon for that LOL )