Handled a few in my LGS that I liked today. S&W M&P10, Sig Sauer, DPMS, and a Scar 17S. Of course the Scar was the most expensive. A couple of questions. This will be primarily a target gun. No hunting. Is the Scar worth the price it commands ($2,500). Is the S&W a good choice for about $1,400? The Sig is a piston vs DI (and more expensive). Any real world benefit to the piston platform? Any opinions would be appreciated. Thanks.