As a type collector, I would choose one of the the most common dates (i.,e. those that are sold at the lowest price). In the grades you talk about, this advice is even more apropos -- as there are unlikely many people chasing 58/61/62 sets and putting money in a less-common date will likely not pay off so stick to "generic" dates. That said, the problem with this series is the way TPGs grade them -- they are really all over the place. You need to be careful not to pick up a "mistake" (i.e. overgraded) coin. It is unlikely (and please don't take this the wrong way) that you will be able to pick a winner from the losers from an online Heritage or eBay auction. The best way is to look at a bunch (like more than 100) coins in-hand and pick one you like the most. Alternatively, have an experienced collector or a dealer you trust choose one for you. I know some people may disagree, but a coin with a CAC sticker is also a good insurance policy against overgraded gold in TPG holders. Just be patient, and don't buy a coin quickly. Take your time and your patience will be repaid. All of the above IMO & respectfully submitted...Mike
If this were typical, one could become very wealthy buying raw coins, slabbing them, and routinely tripling one's investment. Good luck with that, my friends.