My $0.04 is that you have a good plan going. Is the breakout going to be the attachment for a can at some point? If it is, I would have the can picked out and be sure you want it (and it is available) before going with the brake.
Then I would say everything looks good. I have no experience with Troy sights, but I like most of their other stuff so I would imagine they are solid as well.
I take it this will be a defensive rifle or do you plan on hunting with it? Not that the it would necessarily change anything - just curious.