Maybe the best glass I own is an older Zeiss Conquest 6.5-20x.
That said, optical quality is really only important at the range for a hunting rifle.
Leupold has a great reputation for that price range.
I've gone almost strictly to Vortex, but you don't want to hear about that, but it's the best value for the buck there. I don't own Vortex in any other optics as I don't think they rate optically, but on riflescopes, yes.