https://www.youtube.com/watch?v=pEE59GKnk2kThis youtube vid is worth the time to watch. He goes over a lot of options and gives high marks to several Burris and two Weaver models.
My old weaver 6x will not track or adjust well at all so I was wondering about verifying his comments on the weaver, but then again my weaver 6x is about 20 years old.