Seriously, that depends on things like your risk tolerance, how much time and energy for keeping an eye on it to be ready to dump at the right moment, etc. The price of silver swings wild --over the past ten years it's been up 600% and right now it's "only" up 160% --compared to stocks that have "only" doubled (interactive charting here).
There are people who are comfortable w/ commodities (like SAJ in post # 19) and have a far better handle on what to expect than I do. Mining stocks are more my forte, though atm none have popped up on my radar.
The Weekend Is Over, And Gold Is Falling ($1185)
http://www.freerepublic.com/focus/f-news/3211705/posts
those charts make it seem as if the Fed is not printing enuf paper money... very strange...