Check out the lastest study I have found on this topic from http://www.utilitarian-essays.com/expected-option-returns.html
Basically, the latest study with actual call options on stocks (not just one or two broadbased indices) show that At The Money options held for a longer term offer the higest returns. Here is link to the paper: http://papers.ssrn.com/sol3/papers.cfm?abstract_id=959024
CBOE offer a list of options whose strike intervals are at the one dollar level, called the "Dollar Strike" options. This list of options allow us to become more At-The-Money: http://www.cboe.com/tradtool/strikepriceprograms.aspx
Basically, the latest study with actual call options on stocks (not just one or two broadbased indices) show that At The Money options held for a longer term offer the higest returns. Here is link to the paper: http://papers.ssrn.com/sol3/papers.cfm?abstract_id=959024
CBOE offer a list of options whose strike intervals are at the one dollar level, called the "Dollar Strike" options. This list of options allow us to become more At-The-Money: http://www.cboe.com/tradtool/strikepriceprograms.aspx