Good rifle.
As one who owns only Rock Rivers and Colts, iff'n I was to buy another these days (price being an object), it would probably be either a S&W or the new Ruger.
Street price on both should be similar - the Ruger has a few things the Smith doesn't (if that's important to ya) such as dust cover / forward assist.
Since this is your first, you'd probably be doubly served by starting with one of these instead of dropping big bucks, since there's going to be a learning curve AFA what you like / don't like, etc.
Heck, at the street prices for the S&W & Ruger, you could buy, and should you ever decide to spend big bucks on something down the road, you could sell the Smith / Ruger and not lose any money to speak of (if any).
You also have the luxury of having an AR in hand while you can afford to look for a deal to be dropped in your lap (if you go more expensive later) - you might save enough money by taking your time shopping on something more expensive down the road that you may end up basically getting the Smith / Ruger for free!?