Scopes are a tool that most of us want to set and forget. We have to always take care not abuse optics, but other then that, the scope should not need re-zero every year. Scopes are something for which, you get what you pay. Good scopes are expensive. That said, my choice is the Burris Signature series, mounted on either Burris or Leupold rings and mounts. I have heard that Leupold scopes are also very good, but I got a Burris, years ago, loved it and have bought Burris optics ever since.