Heck they will all work. Unless you are making a single shot the magazine length may be the determining factor. Recoil and barrel life might also be a consideration.
the one with the best barrel , action and trigger. stock/bedding , scope and ammo. ie krieger, remington sendero, leup. short answer the remington sendero witha krieger barrel
I would nix the weatherby, unless you are going with an improved shoulder. And forget the rum, its fast but a horrible barrel burner. Consider the 7mm rem may and the 7mm wsm. I would go beltless and choose the 7wsm or a 7mm-300wsm.