Keep in mind that Darbee alters the picture.......so it may be less "true" than the standard 103. And there's been discussions around the net regarding the video processor used in the 103 vs 103D despite the fact that Oppo says that their base performance is the same. Something worth noting too is that the Darbee system cannot make up for bad video transfers of the original material. In fact, it may actually make image blocking worse as it affects everything on screen.
With that said, the 103D might provide better picture (to you) than the standard 103. It's really a preference thing, which may be perhaps even more dependent on source quality. If the source material is great then Darbee will enhance it further. If it is less than great, it's effectiveness is questionable.
I think the standard 103 may be the better machine, from a purist perspective. YMVV