I think when you ask for a 6x18x50 or larger scope and you want to upgrade from a Bushnell Banner for $350 you are wasting your money as you won't get that much better glass in that price range. Shoot what you have till you can add some more money to the budget if you want an appreciable better scope or lower your scope power to the Elite 4200 3x9x40 class scope.....
Another possibility you might try. Go to www.samplelist.com and you might find a demo/refurbished scope on there that will fit your desire. They have some real good buys with hundreds of scopes to look at.