Im leaning toward Fast Shot but Im not sure.

Built to destroy

Might as well wind out to critical chance to the max.

I already got Built to Destroy. What should the second trait be?

Fast Shot>Trigger Discipline, unless you are going to use one shot weapons only.

In my opinion, Trigger Discipline is strictly for those that want to use SMGs and the like. Get Fast Shot all otherwise.

Fast Shot and Trigger Discipline taken together is a bad idea, and a waste of traits. You might as well pick neither if you are going to pick both. I always pick Trigger Discipline because I always like more accuracy in VATS. A Light In shining darkness kicks ass for me too. 100 guns and the Grunt Perk as well.

I love the Light in Shining Darkness, but isn't it kind of small to be a .45?

I voted neither by the way. It's probably my imagination, but I feel like I am wildly inaccurate with Fast Shot.

And Trigger DIscipline 's slowness of rate of fire is annoying.

http://en.wikipedia.org/wiki/M15_pistol

Not really?

If my NCR Ranger Veteran - Brush Gun character didnt have Fast Shot I would've lost to Joshua Graham many more times than I did (1 time) when I fought him just to see how tough he was.

The only reason Trigger Discipline should be considered is if your a horrible shot or have a gun with a high spread like Machine Guns, or if you are specifically trying not to get critical hits. Thats my opinion, anyway.