So, I've decided to plunge into the world of AR's, but have no clue where to start, so I'm coming to you guys for help. I have a budget of about $1300, and would be using this rifle mainly for plinking and target, maybe take it with me out coyote hunting once and a while. Been looking at the S&W M&P15 mostly because of their price. Suggestions? What should I be looking for specifically?