Of the ones you mentioned, 28 Nosler. It's almost 300 FPS faster than the 7mm STW.

If you are open to suggestions, then the .280 Ackley might interest you. 140 grain 7mm bullet, at 3150 FPS. 200 yard zero puts your 400 yard drop at only 17 inches. That's 5.5 inches less drop than the 6.5 creed, and over an inch less than the 6.5 PRC with factory ammo, 2 inches less than factory .300 Win, 3 inches less than factory .300 WSM

All with .308 level recoil.