My daughter has a Senior project that she needs photos for, as a result, I¡¯ve been digging through my archives. One thought is, what lens besides maybe the 50mm itself has as many wonderful and different lenses as the 105mm? I have 3 different Nikkor 105mm lenses, and still lust after the 105mm f/1.4E (I just ran across shots from when I rented it). I have the Ai-S 1.8, 2.8D Macro and 2.8G VR Macro.
Another thought, you might be surprised what happens when you update some of your old photos to the current process version in Lightroom.
Zane