I'd vote for the 270 WSM. All of your choices are indeed good but here is why I selected the .270WSM:
1). There are 11 factory loads (by Winchester and Federal) from 130-150gr. currently available. Bullet choices vary from Ballistic Silvertips, Boat tails, Barnes X, Accubond, Bearclaw and Power Points. This is all you could ever need.
2). The average velocities of the .270 WSM bullets are about 200 fps second faster than the .270Win. However, at the longer distances, the WSM delivers more energy (up to 350-400 ft.lbs) without measurable recoil differences. The WSM is a little flatter also... albeit not that much!
3). The short actioned .270 WSM is a good in-between choice (.270Win. .270 WSM, .270 Wby Mag).
4). Rifle selection for the WSM's is good and getting better. The new Kimber 8400's look nice but are hard to get. Winchester, Browning, Ruger, Savage, Howa, Tikka, etc. all have good offerings.

Well, enough said. Have fun with your decision. Good luck.