if you want "the elite of the elite" then check out
http://www.barrreport.com/. The site's dedicated to the estimative index methodology. A little difficult to comprehend at first but once it's understood it's very easy to follow and produces CRAZY plant growth. My 120g's plant growth doubled in volume every 1-2 weeks.
Tom Barr is some sort of Randy Holmes or Julian Sprung for the planted tank hobby.