I am a brazilian and had the chance to deal with Nevada Coin. I was there to sell some gold coins and they paid me the best price I could fetch in Las Vegas. They are professional, courteous and trustworthy. Before visiting their premises I got a tentative appraisal by phone which I found reasonable. In the shop the attendant offered to approach the manager to get me a (gasp) BETTER price. Do yourself a favor and don’t bother talking to their rude and unprofessional competitors. They will treat you like a moron and quote prices accordingly. For Nevada Coin, five Stars all the way.
For coin collectors, there has always been a certain appeal to the proof set. When deciding to be a proof set collector, one should always consider the state of the collectible coin market as a whole. The proof set value has always been a great indicator of the numismatic hobby, altogether. When the proof set has an increasing value, so will the rest of the collectibles coins within the hobby. If the proof set is declining in value, so too are the rest of the collectible coins. Using this as a guide, most modern proof sets are inexpensive enough for just about anybody to get into a serious collection of these coins without breaking the bank. If their value goes down, there won’t be much money lost.