For $2000, you get a entry level beginner DSLR (D70s).
For $2000, you can also get a low level pro SLR (new F100. Or second hand F5...)
In terms of handling, viewfinder size and brightness, fps, durability, AF speed, the F100 wins the D70s handsdown. If you are comparing the F5, the F5 will simply eat the D70s (as well as the F100), for lunch in the categories I've just listed. It just feels different, and is heavier.
What is it that you need?