Don't worry too much about which cartridge your rifle is chambered for, since most modern chamberings are extremely capable; rather find the rifle that grabs your imagination, then choose the most effective cartridge from the ones that its chambered for, that is within your ability to shoot well. That said the .270 and the .270 WSM are both capable if they're chambered in a rifle that really grabs you. When it comes to rifle selection, consider where it is that you intend to hunt, and the conditions that you'll be out in. In difficult country, the north shore of Lake Superior comes to mind, you might prefer a lighter, shorter rifle, and there is much wisdom in colome's post to that effect. I don't think there is much point in telling you what I shoot, because my circumstances, tastes, tolerances, and personality are all different.
Where I differ with colome is on the subject of detachable magazines, the inexpensive ones are junk, and end up lost, I discovered this back in the dark ages with a 788 Remington. This rifle had an oversize magazine release just forward of the trigger guard, inevitably the release got bumped and magazine was released, never to be seen again; my solution was to tape it in place while in the field. I traded that one off fairly quickly. You might lose an expensive magazine too, so have several with you, but it won't be because the retaining latch wouldn't hold it. Be sure to have a magazine attached to the rifle at all times so that it doesn't get left at home. I prefer a hinged floor plate since there is nothing to lose, and you can still load and unload quickly. I'm not a fan of blind magazines since you have to take the rifle apart to clear a jam.
One area that is seldom discussed anymore is that of iron sights, mainly because scopes are affordable and easier to use well. But there are two good reasons to consider iron sights; one is that the rifle is not out of service if its dropped and the cross hair breaks, the scope fogs up, or suffers some other damage that makes it unusable. The second reason is if your rifle does not readily accept scope mounting, or mounting a scope spoils the rifle's handling characteristics, although these examples are becoming rare.
When choosing a scope, consider the range at which you intend to shoot, and the size of your target, and choose appropriately. Many, myself included, prefer low powered variable scopes, but a visit to Dogleg quickly lets you see that in his neck of the woods more magnification is a good thing. Keep in mind though that the purpose of magnification is to enable you to see your target. You don't need 16X magnification to see a moose at 25 yards, and worse if that's what you have, you won't find the moose in your small field of view. If you're as likely to not see you moose at 500 yards, then 16X comes into its own. So magnification is not the primary advantage of the scope sight; in the scope the reticle and the target on the same focal plane, that is the advantage, because both target and aiming point are in simultaneous focus, whereas with irons, once you're on target, you must focus on the front sight, allowing the target to blur. Then there's choice between aperture and open rear sights, and the correct choice of front sight, but I won't get into that now, because you might not even want irons on your rifle.
While we're on the subject, purchase good quality scope mounts. Now "good" covers a lot of ground, but if your budget is tight the old time Weaver rings with the big windage screws and spring steel rings mounted on a slotted base are better than they get credit for. They can be a bit of a pain to mount, since the scope tends to roll as the rings screws tighten, but before long you figure out how to index the scope so that it rolls into the correct orientation as the screws tighten. I like Timney and Warne QD rings, Leupold's duel dovetail arrangement, and I'm a fan of the excellent, if comparatively expensive, Near mounts.
Decide if your rifle will wear a sling, and if it does, will the sling be simply a carry strap, or if it will also be a shooting aid, this will dictate the type of sling you purchase. If you're going to shoot from supported positions, and intend sling up there are many good choices from military loop slings, to Ching Slings to Rhodesian slings. If your rifle generates significant recoil, it might be prudent to locate the forward sling swivel further forward. On hard kicking rifles I put mine on the radius of the forend tip which eliminates the possibility of my support hand being gouged by the front swivel stud.