There use to a notch similar to the colour you described i Shelburne and it was one of the nicest foxes I've every seen.
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I would go with a factory colour vs. a modern colour. To me the "newer" colours for the most part do not belong on a Fox and cheapen the look. With that being said it is your car but I also think potential buyers will have reservations about non stock colours.
How about Blue Onyx? A dark blue,almost black.
I think I'm back to black again... I'd like to pull the engine this weekend and start the next level OCD on the thing. But I still have fucking landscaping / decking to do :(
There was a notch around shelburne area that was painted 1975 mercury comet powder blue and it looked good