Re: favorite scope $500-800
In that price range a used Leupold is where I would spend my money. For $800 you can get a higher end scope in the LR series with a 30mm tube and side focus. If it does not come with target or M1 knobs it can be sent back and have them added for a reasonable price.
I know Leupold does not get tons of love on this site but look at the PICTURES. Many, many, many very respected smiths and shooters using them and for good reason!
Yes, they loose when compared to a NF or S&B but they are a fraction of the cost and tough as nails. At that price point you can't go wrong. Also, go used, lifetime warranty is good for whoever has the scope.