I have been looking at optics for my AR recently, feel like I can do a little better than just iron sights. I was looking at the strikefire vortex and read mixed reviews on it. I've never seen or held one before, so I don't really know what to expect. I'd like to have something where I can reliably group shots at 100 yards. I'd also like to stay between 1 and 2 hundred bucks on it.