Sounds like you may be a one rifle man so you need to make one good choice. Nothing wrong with that. I would have to suggest sticking with the standard chamberings for versatility and availability. The .270 Win. will take any deer walking with no problem. The .30-06 will be even more versatile. I am afraid the Short Magnum may be just a craze. The .300 WSM is probably here to stay, but in the long run a person may find the old tried and true chamberings more friendly.