Re: Can't decide which 45-70 to get.
In fact; all factory 45/70 ammo is loaded under 29,200 c.u.p. unless otherwise specified. This is still too hot for Trapdoor actions but is fine for 1874 actions and all lever guns. If you want a lever gun take a look at the Marlin 1895 Cowboy--it has a 26" octagon barrel and a full length magazine tube with deep, ballard cut rifling. It's also IMO a more faithful version of the 1895 than the stainless 18.5" gun, which has a reputation for delivering fearsome blast and noise along with stiff recoil.
If going with a single shot I would recommend the Ruger #1--but it would be a handloader's platform to take full advantage of the action strength. My personal favorite is a Sharps Repro, but again, it's basically a gun for the handloader to play with.
Also; if you are interested in heavy bullets (think 500 gr. or heavier), the lever rifles will limit you in your powder choice to maintain a shorter c.o.a.l. than you need with a single shot. If you want to load up to the rim of insanity, go with the #1 which will take 60,000 psi--basically a .458 win mag. If you want a handy brush gun, shooting factory ammo, the 1895 is an excellent choice.
Life's too short to shoot an ugly gun.....