Well, I just looked back at the O.P. and there is no indication of that poster owning one or all of these firearms, so for me at least it would come down to what I wanted, versitility AND COST!
Being like many/most avid shooters, I'd likely want at least one of each which would also take care of the versitility factor.
However, realitity being what it sometimes is, COST!! does, at least at this house, prove to be a huge factor if I'm looking for a working/hunting firearm.
So, if cost is a factor, and it is, then the versitility - best bang for the buck (pun intended) - begins to rear it ugly head.
The O.P. does not indicate if he will have the oppertunity to hunt anything other then the deer he speaks of so in his case, as has been pointed out, the .44 will do just fine within the confines of his post. End of discussion, or is it?
Does somewhere in the back of the O.P.s mind lurk the dream of a black timber hunt for that once in a life time bull elk?
Hmmmmmmmmmm??? we don't know. But if it does, the .44 is clearly out and if the dream of black timber desolves into high and open meadows, very possibly all three due to the possibility of extended ranges.
Where does this leave us? Well, in light of the info given in the O.P. it still comes down to personal likes/dislikes and opinions and the bucks available.
Therefore, with my limited experience, but now having taken an elk with a cast boolit, I'll hang with, "make mine the 45/70".
It is not just good/big enough, it is AWESOME!
Keep em coming!
Crusty Deary Ol'Coot