After researching all I could, I bit the bullet and bought a Vortex Viper PST 2.5-10 x 44 today. This should be a excellent low light scope as well as having adequate magnification for my application.

Thanks to all who responded to my earlier post.

Thanks also to Kody at SWFA who was patient with me and answered all my questions. It was he who suggested that particular scope, as I had thought I HAD to have a 50 mm for best light transmittal. It was helpful to me to have a real person to talk to and not just live chat.