Yeah it a good camera or a good starter camera it all in how much you really get into it as being a starter camera. I started off with the D40x and it was a great camera till I wanted more control.
With the lens your getting with not so good for wildlife as their a little short and I don't think the teleconverters will work with those lens. If your looking for a wildlife lens I would get the 70-300mm VR lens or something bigger the 70-300mm VR lens is even pushing it as using for a wildlife lens but will work.
All Nikon DSLR's are good. But the glass is what take your pictures. So when ever your ready to buy new lenses save your money and buy the best glass you can because it makes a big difference.
Join a all Nikon forum is a good way to help you learn. I'll send you a PM to the one I use. I would not be where I'm at today without that place.
Anybody else that would like some info on that Nikon forum I use PM me and I'll send you a link. I don't want to spam everybody on here.