I am about to upgrade from my D300S to ????.

Most of my photography is of birds, fungi, native orchids and fast flying model jet aeroplanes, I like the DX format for the birds; but am wondering if I should take the step to FX. I have looked at the specs of the D500, D750, D810, the more I look the more I am confused.

What am I to do? any ideas out there.


Thanks Ross.