Pining away for new or upgraded equipment is a fool's game. Use what you have. Until (if ever) your photographic equipment fails you, or fails to perform to your needs - you're good.
Elvis knows what you're thinking; "Easy for you, Elvis, you've got a top-of-the-line Nikon and quality glass". True enough. But understand that Elvis used to roam the Lambeau Field sidelines taking pictures of the mighty Green Bay Packers. The old Nikon D100 just didn't cut it in terms of speed or in image quality. The newspapers Elvis worked for demanded high pixel count, even though they printed medium quality jpegs no larger than 6 inches by 6 inches. So a Nikon D3 it was.
Short of sports or weddings (or battlefield or space photography) you simply don't need that much camera.
Elvis sometimes shoots with a Nikon D7000 and thinks that in many respects it's better than the D3. The D3 wins in speed and high ISO (low light) shooting, but the D7000 wins in almost every other category. Reviews of both cameras coming soon to www.elviskennedy.com.
Pining for something better (or newer, faster, etc.) leads to stress. Be happy with what you have and you'll be happy. Like what you have and you'll have what you like.