If I were to go for another 45-70 it would be the Marlin, no doubt about it. I'd get the
full size model with the pistol grip stock, and 22" barrel. I'd have the barrel cut to 20",
recrowned, and remount the front sight. Then install a Williams white bead on the front,
and Williams rear open sight with the shallow V blade - very quick/effective combo.
For a scope, a Weaver 1-3x or maybe a Leupold VXII, 1-4x.

Only other rifle I'd consider in 45-70 in the Ruger #1. Very nice, and good balance.