All things run in cycles. So have an endgame in mind. I do believe Silver has been undervalued for some time, so I'm not sure that it will ever get back to $5/oz. that being said, but eventually the price will level off some where, and might not have much growth for some time. Just some things to keep in mind. I do think it will keep going up for awhile though.
I just sold about 24 oz. last week for $36/oz. Helped me pay some debts I needed to get rid of.
Another poster mentioned some silver coins becoming more scarce b/c of people melting coins. I was digging thru some junk silver I have and pulled these out. They aren't in great shape, but they are semi-key dates, and could be worth more someday b/c of people melting.
Washington Quarters (all under 10M mint and under)
1949d
1940s
1939d
1938s
1938
1937d
1936d