You really need a 35 rem. With the pure bone crushing power that just drops deer even if you dont hit them. I really dont see how you have gone so long without one.
All joking aside, I would rather have rifles chambered in two different calibers over two just about identical rifles in the same. As far as hard times go, you can be a little more opportunistic in case they run out of 30-30 you could pick up that box of 35 remington sitting on the shelf that no one else is able to use.
By the way, your a lucky man with a wife like that.