I would have to go with the O, the Charlotte would be nice but the hit on the 9 is to distracting and I also like the near terminal die state of the reverse on the O
I'll take a CBH please. The overall design is beautiful and I am not much of a fan of colorful toning. That one shows slight golden edge toning which is quite beautiful. Oh, and might I mention: Die cracks galore!
The 39-o CBH, only because I'm shopping for one right now and its just plain cool to have a mint marked capped bust.
I would take the gold because I have all of the others (besides that 1839/6 cent - that one is quite tempting too!). BTW, that is an interesting way to put and illustrate your question. I could do the same thing for the year 1795 (minus the gold.....).
I would take 39 N1 because I do not have one. Not to start the whole what is rare thread again, but it's not a rare coin.
Only one, why not all? But I would probably choose the gold one simply because I don't have any gold coins as of yet.
In order 39-O CBH, 39 N-1 cent, 1839 CBH, 1839 Seated, the other 1839 cent, and last of all the gold piece.
I would go with the Charlotte gold. First for intrinsic value then for the special mint mark. Without researching rarity and values, I would most likely always go for gold if given the choice out of that group. Matt