Not sure if your still looking, but the next goldberg auction has some nice 98s in that vf range... http://images.goldbergauctions.com/php/lot_auc.php?site=1&sale=84&lot=351 http://images.goldbergauctions.com/php/lot_auc.php?site=1&sale=84&lot=341
Copper is treacherous. Make sure that you have someone knowledgeable look at the piece for you, as the TPGs can be unusually forgiving on coins from this era. A number of slabbed coins will have issues with porosity. I have even seen coins with a bit of corrosion overlooked. If you don't have someone to look at the piece for you, I would suggest that you seek out a coin that has been stickered by CAC. Also, don't rush into buying the first one you see. Look for the most eye appealing example you can find in your price range. Another possibility might be to save up a bit more and pursue an even nicer example, which would be worth it in the long run. You get what you pay for in numismatics. The cheapest coin isn't necessarily a good deal.
I only have one coin from 1700's in my permanent collection, seem to fit your criteria. Might be similar examples out there. $300-$350 coin:
I like your Kitty Mainbill. I agree with not rejecting these late 1700's US cents for having mild porosity. In fact I aquired one cheaply just because someone thought that the "so called, mild porosity" meant it was not real. Interestingly, though, it must be a 300 yr old not real one. Are there any 300 yr old counterfeit pennys?? No one would waste their time in the late 1700's with a penny, would they???
I like your Kitty Mainbill. I agree with not rejecting these late 1700's US cents for having mild porosity. In fact I aquired one cheaply just because someone thought that the "so called, mild porosity" meant it was not real. Interestingly, though, it must be a 300 yr old not real one. Are there any 300 yr old counterfeit pennys?? No one would waste their time in the late 1700's with a penny, would they???