Low Leupold PRW rings are about as good as you can get for strength and cost, The Nikon Prostaff shotgun scope Swampie mentioned is good as is the Nikon Omega scope which has 5" of eye relief, the Omega is in low PRWs on my SS 45-70 Ultra, I shoot Ruger loads in it. I use the H&R base, but if you want a stronger base, one of the Warne steel bases is an option.
Tim