Buy one yet?!
You got some great first and second hand advice on this one and I'm curious if you pulled the trigger on one or the other yet (bad pun intended).
I went through sort of the same decision making process a couple years ago and ended up with a No. 1 in 93.x74, with which I'm very happy. Ammo and components are very easy to come by and the rifle's a dream to shoot, although I haven't killed anything with it yet.
Nothing wrong with the 45-70 (got one, like it) and it would have been the choice if the Spartan/Remington single option had ever panned out. The doubles, even Sabatti, were out of my price range unfortunately. So I settled on the Ruger single and was torn between the 405 Win, 450-400, and 9.3 available at the time. The 450-400 would have probably topped the 9.3 for cool, barely, but significantly more recoil and probably more importantly, price of shells, brass, and components, pushed me to the 9.3. Can't wait to actually shoot something with it. In the meantime, I am confident of having the most novel rifle in camp where I hunt.
Update please! -WSJ