Hi,
a D3 and a D3X belong in two entirely separate categories. The D3 is a very versatile camera, high FPS, full frame, tough build, used with anything from sports, journalism, portraits, landscaping and weddings, the list goes on but I haven,t had enough coffee.
The ISO capability available with a D3 is a very useful tool, it's revolutionized the digital world and you'll still hear folk raving about about it now, including me!
The D3X is a different camera altogether, it's geared toward a different market.
To be frank, many pro's have discounted buying a D3X at this time, even Joe McNally is sticking with his D3.
Ask yourself if have you all the quality glass you need or may need before dropping 5K+ on a body.
Also what kind of computer power do you have? The D3X's NEF files are enormous and even the most capable systems are going to chug a little with those kind of sizes. In addition to these considerations, think about hard drive space, your going to need lots more of it = more expense.
Unless your making a killing on supplying stock images, high profile commercial or studio work etc a D3X is surplus to requirements.
I think most working folk may look at pricing one up but not for another 12 to 18 months minimum. It would have to drop to below 3K for me to consider one for portraits and landscaping.
The D3 may even be surplus to your requirements if you only have a few lenses.
Spending 5K on lenses is never bad, no matter how unhappy your partner would be
