My BSA is going to need to be replaced before next season. I figured this would be a good time to get a better grade scope on this .270 that I've had for 15+ years. What's the best scope for under $300?

Any input is appreciated. The ones I've look at online are:
-weaver classic extreme
-Vortex Crossfire II 3-12x56 30mm Hog Riflescopes
- Nikon prostaff