I am the owner of a new sendero sf II in 300 win mag. I would like to be able to shoot game out to 500 yards max. I am on a budget and am looking at the vari x II in 4-12x40 AO and the vari x 3 in 4.5-14x40. I am looking at $700 max for the scope with tax. Are these scopes a good option? Any and all suggestions welcome. Thanks!!