You are enjoying that new camera, aren't you!
..d
I've now found that I need a macro lens and a decent telephoto.
As you have only the D40 you cant use CLS with off camera flash, but a SB6/800 and a remote lead would be a really good thing for macro.
My 'wants list' currently runs to a decent superwide zoom (sigma 10-20), and an 80-200/2.8 or similar
A long telephoto would be nice but isn't quite justifiable yet.
Which lens do you have?
..d