This actually brings up a good point. Do collectors generally value "all original". ? I know i will be replacing all my gas displays with led displays as the originals fail. In my opinion, why keep a dangerous and technically inferior piece of technology in place in the interest of "value"?
I have classic cars too, so the same principle can apply there. You see the occasional 8 track player in the dash, But generally, new tech that doesn't negatively impact the look of the car is welcomed. (i.e. Fuel injection, halogen, cd/ipod, etc,)
On point of the original post, i have rotten dog in the F14 and pinscore in Taxi. If there is a rottendog for your machine, go with that one for cost sake. I am happy with both of mine.