IMHO, cartridge spacing is essential to building a worthy rack of rifles to work from.....

Don't "duplicate" what you already have --- Given you already have a 30-06, I can't imagine why one would want yet another 30 caliber in the closet unless you are going to get a "super 30" like a 300 RUM or Lazzeroni or Weatherby (30-378).

Find someone with a 338 something and a 375 something, try them both outand go with the one that floats your boat. [One thing, get enough case capacity in your cartridge to let it really perform. IMHO, blown out 30-06 case cartridges like the 338-06 and 35 Whelen lack potential when you can just as easily go with the "real deal" that was designed for that bullet right from the get go.One can simply down load them a bit ifone needs to go a little "softer."]

Big guns can be loaded down to little gun levels.
Little guns will always be little guns.
If you are going stronger, then really go truly stronger.

Assuming you are in good health and of a rigorous nature, ignore the recoil mythology and get after it like you mean it.

Otherwise, if you don't already have a set, then consider getting some top, top flight binoculars instead of the new rifle.

Scope.... Leupold, no higher than 2 to 4 power on the low end; top end is much less important.

EKM