I would build a .25-06 AI, 7mm Wby, and .300 Ackley Magnum (.300 Wby Ackley Improved 40* Shoulder....PT&G has the reamer print available).
The reason being is that I have had my .257 Wby Mag since 2008. It's an awesome caliber, and one of my favorites...But I have discovered that my .25-06 AI does the exact same velocities and energy with 10-15 grains LESS powder. It's much more efficient. And brass lasts longer, and I can get .270 Win brass for really cheap and everywhere.
And the .300 Ackley has a little more velocity and efficiency compared to the .300 Wby, even though you form brass from regular .300 Wby brass. So if you have .300 Wby brass already laying around, the only expense is a custom sizing die, which you can have a complete custom set made for about $275 from Whidden. Or you can do it the cheap way, like I do, and use my .300 Wby neck-sizer and seater die. Kind of cheating the system, but it works. Necessity is the mother of all invention.
My appologies if you are wanting a complete set for sentimental reasons. I was just trying to help by suggesting some more efficient caliber options.