RE: 270win or wsm?
I'd stick with the 270. If you don't reload then I think its the better choice. A 270 is a very flat shooter and will kill whitetails well beyond the range that 99% percent of the hunters on earth should even attempt a shot. It is also quite capable of killing even elk sized game with the right bullet.
The short action advantage of the WSM is a pretty much a bogus issue for most hunters unless you are going to be hiking for miles into some remote outback. And even under those circumstances there isn't enough difference in the weight (if any) of 270 wsm and a standard 270 to matter much. The thought of someone being perky and fresh after a mile hike with a 270 wsm yet dragged to his knees near death by a 270 is silly at best. I know it is widely stated that the design of short action bullets are inherently more accurate but again I think the differences are microscopic at best. There are so many factors that affect the accuracy of a particular gun that the odds of this type shell improving yours are miniscule.
Bullet selection/availability will of course be better with the 270 and cheaper. And consider this: the WSM's are fairly popular now but what about 5 years from now? If you don't reload and the popularity of these new cartridges falters then availability could realy dry up. And it could happen. I know a lot of people who pretty much feel like I do that these new WSM's really don't offer much more (If anything) over their longer forefathers. I personally think they are just an attempt to come up with something new to sell guns. I'm not saying there's anything wrong with them mind you but I just don't see the big deal myself. I have shot a 300 wsm and a 270 wsm that a friend of mine purchased. They were Winchester Super Shadows. Both were fine. No problems noted but then nothing special either. If I had a choice between a 270 and a 270 WSM I 'd get the 270. If I had a choice between a 7mm mag and a 7mm WSM I'd get the 7mm mag. Same deal with the 300 mag and 300 WSM. The difference in bullet drop and ft lbs of energy are not enough to make any appreciable difference in any hunting situation in my neck of the woods. Availabilty of bullets, price and the comfort of knowing I had a gun chambered for a cartridge that had already survived the test of time would be my reasoning.