http://dberri.wordpress.com/about/This is a great site for what you're looking for. It dives pretty deep into "Wins Produced", a stat devised by Berri and one of my favorites. As with any statistic, it has its flaws, and the essence of Wins Produced is to put a high value on efficiency and possessions. The flaws include how a player gets their production (for example, a player like Joel Pryzbilla will have an extremely high Wins Produced stat, because he rebounds at a high rate, shoots a high %, and doesn't turn the ball over), but it doesn't look at the fact that he doesn't create any offense, it's just garbage type baskets. So keep it in context.
I highly recommend the book "Wages of Wins" by Berri. It goes deep into some NBA stuff and attendance/revenue vs. wins, etc. Very good read.