Lots of good advice here. I agree the answer for a 10x7" print: For image detail, no significant difference. For high dynamic range scenes D800 should win easily. At base ISO no difference but at higher ISO the D800 will kill the D200 easily, given the much cleaner starting point and the amount of downsampling.
Change the thought experiment to D700 vs. D800 on a 10x7" print and now I think the difference is not so clear, but close enough that we'd need to know more about D800 to hazard a guess. I raise this last issue just to point out that if you're printing small (let's define that as up to 13x19") then the D800 is not the ideal camera. There are other cameras that won't tax your storage capacity and processing power, and will leave significant money on the table for better glass, lighting, or other things that are more likely to increase your image quality in ways very visible in small to medium-size prints.