ya that's what i figured. i think the problem was that my uncle, having a d90, would never even consider a 3000/3100 or 5000 because of lower specs, and the fact that he has some older manual lenses that would, as i understand it, be incompatible with those models.
he is a semi-pro photographer and the d90 was his first digital slr so that he could find out how it works, and then buy into a better body when he learns how the digial slrs work. he's very happy with the d90 for now, and i feel like for him it's a good choice to stay with d90 until a d400 is released.
I on the other hand, am just getting into photography. Whenever i do any purchasing, i do a lot of research, so i learned everything from the basics to bokeh. and i personally don't believe it would be a good investment for me to get any dslr below the d90 in terms of specifications and compatibility.