[VinnyP]

The Sensor on the Fuji is very good for dynamic range and skin tones but for Macro the D200 is probably a better choice as it has higher resolving power.

However if you are only going to be shooting Macro then all the features of the D200 and even D80 will be wasted all you need is a good sensor and a good lens. The only other thing that is a real help is liveview (which is genuinely amazing for Macro and will transform how you shoot, I'll be happy to expand if this is a consideration for you) and for that you need a D300 or another brand. If your budget stretches to a D300 then great.

If you can forgo liveview and really only want to shoot Macro then I would be sorely tempted to invest in better glass and save on the body. A new D60 or used D40x and the Nikon 105VR would produce as good Macro results as the same lens on a D200 (same sensor) and probably better than a Sigma 105 on a D200 (and I own and love the 105mm Sigma)