I spent 30 years in LE and I guess I'm a little OCD on this subject. I have to agree with the other fellows until it comes to a firearm intended to defend my life with. I have a long standing, firm rule based on a lifetime of having my life depend on a firearm. That rule is this: my life is worth more than a good bargain, so never confuse a range gun with a defensive gun.
I have a Palmetto M4gery that I like immensely and trust implicitly, etc. etc. etc. BUT I also have a high dollar LMT M4gery that is my ever-cared-for go to rifle in times of imminent danger. I meticulously keep it zeroed, cleaned, lubed, tested, and stored. I fire it only to test it and its magazines, loads, optics, and so on, and never use it as a range/fun gun. I keep it in a safe with a loaded mag in the well and I have total confidence that it will perform well when called upon because of its great quality of manufacture. I feel that way simply because LMT equipment goes to war and Palmetto's equipment doesn't. So I don't have the same assurance with my Palmetto, although I think it is a very good rifle.
So my advice would be to get the Colt for your defensive gun, but use the other rifles to keep your skills updated and sharp. After all, how many LE outfits use Wyndham's, Palmetto's, M&P's, and how many use Colts?
I know this sounds a little over the top, but having your life depend on a gun does that. You already have a couple of good range guns, now get one you are willing to bet your life on (if you intend to use an AR for defense.)