AR newbie here. My first (and likely only) AR is a S&W MP 15. My budget for an optic is $450 or less. Not interested in anything made in China, been there done that, I only have one AR rifle and I am absolutely going to bite the bullet and do it right this time in terms of a premium quality optic. Ability to co-witness iron sights is a must. My gun is factory stock other than a Magpul forearm and will remain that way. Quality and reliability are my priorities. Opinions?