I'd skip the Timney trigger, I much prefer the Geissele G2S.
Second the Proctor sling and prefer the Streamlight SLR1HL 600 lumen light over the Surefire.

I have scoped AR's and a red dot on one but lately I've been using a Colt 6720 with just a DD A1.5 rear sight. It's so simple and light weight, it seems to jump out of the safe every time the door opens up.

Keep it light and simple.