Vortex Viper PST is ok but not my go to by any means. I find my Viper PST FFP 4X16 to be less clear than my Leupold Mark6 or any of my Nightforce NXS scopes. I would suggest the Nightforce SHV it would be in your price range.
http://www.opticsplanet.com/nightfor...iflescope.html