Between the two, I'd still go with the D70s. Despite the D100 being a higher end model at the time, the D70s is newer, and overall, a better camera IMO. I've shot with a D100 before (wearing a lovely 18-200 VR nonetheless!!), and between that and my D70s, I preferred mine.
Yeah, that's what I think. But why does the D100 cost the same?
I know no current Nikon cameras match the D100 in terms of eyepoint.