I'm kind of new at this. I shot film camera's for years and then lost interest. I purchased a D70s when it came out and shoot maybe 200 pictures with it. Then I purchased a Canon G7 & later A G9 that I used all the time. Family pictures, etc.
Recently one of my friends got me interested in birding so I started to use my D70s with all my full frame AIS & D series lens. I was getting very good results. I then bought a D300 body used and got even better results.
I have been waiting to see if this D400 body comes out before I buy my next body. One way or the other I think I would only buy FX lens because if I decide to go full frame I've got all my lens. I've looked at some used D700's and considered the D800, but I don't want to go for $3000 at this point for what I am shooting.