Also, lets not forget about Platinum. The US Mint also products platinum coins.
Kitco Complete Bullion
I started "investing" in silver and gold coins for these reasons and more:
1. The two richest people in America are betting against the dollar. and
Bill Gates and
Warren Buffet
They are interested in foreign currency (Euro). But, the dollar recently staged a comeback.
2. Inflationary Worries. As the purchasing power of the dollar goes down, the value of PM goes up offsetting the higher cost of goods during an inflation.
I am worried about inflation because of the massive amounts of foreign debt we hold was well as the effect of higher energy prices on the economy.
3. Silver being undervalued.
Google
I chose modern bullion coins because they are more recognizable, and are illegal to counterfeit. (They are still considered US Currency). Bars and ingots may be assayed when you sell them to ensure mineral content.
The down side to coins is that you have to pay a premium for them (more than the spot price of the PM.)
I would also store them in an insured safe deposit box. Some banks will give you a complimentary safe deposit box.
I am not going crazy buying as much as I can. Just a little here and there. It is never a good idea to put all you eggs on one basket.
I also suggest reading
The Coming Collapse Of The Dollar. It explains how fiat currencies always fail because the governments can't resist printing new money.