So my initial plan was to go with a D800, but having tested one out, I hate it for sports! The AF is just really jittery compared to the D3, and feels all over the place.
So I tried a D4s and I'm in love! The AF is insanely good, it's fast and always ready to shoot. I shoot Equestrian events mainly, along with airshows and Formula One.
My initial plan was to get a 2nd camera body, as I want to be able to use multiple lenses at the same time without having to change them all the time.
So it seems getting the D4s would be ideal. However, I've had a think about how much money the D4s actually is, and what I could get for the same amount.
I currently own:
Nikon AF-S 70-200mm F2.8 VR
Nikon AF-S 50mm F1.4G
Nikon AF-S 85mm F1.4D
Nikon AF-S 600mm F4 VR
Nikon AF-S 1.7x TC
I could potentially add for equal money:
Nikon AF-S 24-70mm F2.8
Nikon AF-S 300mm F2.8 VRII
I love my D3. I struggle to find anything wrong with it, although it might be getting a bit old in terms of low light photography, compared to the D3s/D4/D4s, but it's a solid performer for anything else. And having been told to invest in glass before bodies, I almost feel like I would be better off doing this and maybe getting a D4s towards the end of the year.