I'd personally go for a 1895 CB Marlin -- I've put a Wild West extractor, trigger kit, follower and big loop lever on mine. I also had all the internals polished by my local smith, as well as the biggest recoil pad I could find put on it. I may try some mercury tubes for using the Garretts in it. I'm very impressed w. the quality of the WWG parts. They seem like nice enough guys when I met them at the SHOT show, but I think they have so much work, that unless you really want a cut down guide gun, or a 50 Alaskan/457 WWG magnum, I'd just buy the parts. I also have a trijicon reflex sight on mine, which I'm quite happy with. Personally, I'd be quite happy w. the 45-70 -- Garrett cartridges provide all the power I'd need.
Now, w. that said, I admit I'm thinking about a 405 Winchester, in maybe an 1886 Winchester...or maybe a 45-90 to try and get some more room to lower the recoil w. high power cartridges -- but my only real interest in that is that I want to use a lever gun to travel around the world hunting.
Now, I'm not sure about this, but I suspect that the recoil on a pistol griped lever action may be easier to handle -- but I never really had too much problem until I shot 18 garretts in a row.