Don't forget the +1% surge, +1% accuracy, +1% crit, etc you can get from maxing out your companions affection.
See http://www.wikiswtor.com/Affection
I aim for roughly 75% surge, 100% accuracy, and 30% crit (unbuffed) - then as much willpower, power and endurance I can get.
My assassin on AMR http://swtor.askmrrobot.com/character/88f81646-86f4-4944-bde7-92a445807178