IMO, the best under $200 scopes are the Sightron S1 3x9x40 Mildot, and the Bushnell 3200 10X. For a little more the Nikon Buckmaster 4.5x14x40 SF, mildot is a nice scope.
Tan stocked rifle is a 7WSM, middle is a spec M40A3, other is my beloved 223AI. Springfield M1A, and S&W MP15T. I have a "couple" more rifles, Ill get some updated pics.
I have an M&P 15T. It is a fantastic AR15. I put a TA31 ACOG, and a few other goodies on it, and have been banging away since. It actually shoots very well with some of my pdog ammo. Less than 1MOA. I can wait to use it for coyote calling!
Im a fan of the standard black web slings that come with may AR15s, simple because they are simple. Another goodie is a BlackHawk (I cant remember the part#), they are like the standard slings, but a good bit longer.