I used to be in the crowd of people that would write a list and then take it to a tournament. I have been trying an experiment since the new Eldar codex has arrived at sticking with a list and honing it to a sharp edge. Once I have the list where I want it, and the requisite experience playing it, I will retire it for tournaments only and begin crafting a new list. I would love to have three or four very different and very brutal tournament lists that I can draw on based on where I will be playing. That's the goal anyway. Wish me luck.