I changed from Canon to Nikon when Nikon released the flagship Nikon D3. I used Canon for nearly 20 years. The reason that I changed was because of the fantastic ISO results that the D3 gives on high ISO. Now Im using the new Nikon D3s who is even better than the old D3 on High ISO
For me as a naturphotographer who photographs a lot in poor light, this is worth gold.
Kamera:
* 2 x Nikon D3s 
Lenses:
* Nikon 500 f4 vr
* Nikon 70-200 f2,8vr 2
* Nikon 85 f1,4
* Nikon 105 f2,8 vr macro
* Nikon 24-70 f2,8
* Nikon 14-24 f2,8
* Nikon 200-400 f4 vr2
Flash:
* Nikon SB 900 and SB800
I also have 3 Henzelflashes I use in my studio
Tripod:
* 2 x Sachler DA 75 L 2 x whit Wimberlyhead 2
and ballhead.
* Lowepro Pro Trekker AV2, and different smaller bags. 