Scope for 300 Win Mag

I'm looking for a scope for my Ruger M77 300 Win Mag. I'd like something with turrets that should make 4-500 yard shots fairly easy.
Let the recommendations fly. Would like to stay under $700 but for the right scope I might be willing to spend around $1000.

Swfa 5-20x50 one was for sale in the ad section.. if you cant get one of those the viper pst ffp mil mil