The best plan is the one you can follow. If that means picking from different plans, then so be it!
I pick a little here and there from different plans to suit my lifestyle. Calorie counting is the first and foremost thing that grounds any food decision I make, but I also follow the Primal Blueprint most of the time, and below that I just try to eat mostly whole foods. There's no need for me to be "perfect" on any one plan because I'm following MY plan and it's tailored for MY LIFE.
I recently got a free Atkins startup kit and I'm looking to try and incorporate a little of that into my diet too. It was the bars that sold me—they were pretty darn tasty!