>It's not the pixel density but the angular pixel density that >determines susceptibility to shake. The D800 has 100 pixels >per degree, the D7000 only 67.
How do you figure that?
Look at it this way... if someone can make an 30x20" enlargement with a 200mm lens on a D7000, then you should have no problem making a 45x30" enlargement with the same lens on a D800. Additionally, you should have no problem making a 30x20" enlargement with 300mm lens on a D800.