Have you tried Market Samurai yet? During the trial version, you have access to the SEO competition module which will tell you the competitors page rank, how many backlinks they have, how old their domain is, the total number of authority links, whether they are listed in DMOZ and Yahoo Directories, whether they are ranking for the keyword in the title, whether they are ranking for the keyword in the url, in the description and in the meta tags, also it will tell you how long its been since google cached the site.
With this information, you can determine what you need to do to strengthen your position and rank higher than your competition.