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.
+1 for the Leupold also! It is a great scope and for the money you can't beat the glass. If you are going to shoot competition, I would suggest N/F or a S/B because the constant moving of the internal parts (windage and elevation adjustments) just won't hold up in the Leupold. But for a hunting scope I don't think you can get much better in your price range.
x1 on the sightron, best bang for your buck in my eyes..just bought one 5 months ago and couldnt find a bad review on them and now that I have mine I see why! Great optics, Great tracking of the turrets.
Last group of scopes I purchased where the WOTAC's made by Wonder Optics. The scope I choose are the 4 x 14 x50 I use them to well past a 1000 yds. I have 60 year old eyes and they seem to work for me. I have a friends that have some of the high dollar scopes and I really can't tell the difference when looking through them the Nightforce seem to be the worst for me as there is a blue hue around the targets at first figured it was just one target but it was all targets. Matt is good people his goal per him is to make the best scope possible and comparably to the high dollar ones but to keep the price where anybody can buy them.
Here's Matts web site. Wonders Optics, LLC - Wonders Optics Home Page