One last comment before I have to move on... despite the posts here to the contrary, highly collectable high numismatic value US gold and silver coins are easily sold legally at many dealerships. Yes, you will take a hit on the sale of these coins, as the dealer always tries to sell at the top price, and buys at a lower price (the way the dealer makes his money.) There is NO reporting done, and none is required by law. Could such a law be passed? Highly unlikely, as many in government have large holding in high-dollar collectable US gold and silver coinage.
Don't forget to look at the latest US Mint coinage - like pure silver 1.5 oz Polar Bear coins. Many advise buying more silver than gold coins, as it is highly likely that it will advance faster in value than gold will in the near future.