Look for something that has gotten its @$$ kicked over the last couple of years and is below its mean 5 year moving average price. Like Oil. There are some bargains out there in oil companies and oil services companies.
First rule — Buy Low. You can do that by researching industrial sectors and commodities that have gotten mauled over the last few months or years.
My market playing friend likes a natural gas ETF. Unfortunately, he bought at the top of the double bottom upswing, but it is still a lot lower than it was last year. He is being philosophical about it and says he believes that by 7 years he will double his money.