Use #3 and I will hold onto the other two for you . . . Just kidding, I would use #1.
I went and shot the 270 (#2) this evening and think it will probably get the job. I got the first 12 shots through it cleaning every round a few days back, shot 9 150gr round nose federals just to get on paper and start the break in (a friend bought them by mistake and gave them to me). The last 3 shots I switched to the 140gr accubond load I use for the #3 rifle and it shot just under 1" cleaning every shot. After letting it soak and getting all the copper out I shot one of the round noses for a fouler, and then my first 3 shot group without cleaning every shot. I made a pretty little cloverleaf, outside to outside was .68" center to center was .4". Next step is to get it over the chronograph, but I think my chances of getting 3K and matching my CDS turret are pretty good.
I like the Model 70 Winchesters a lot in .270. I'd go with that gun no matter what else you had.
I called up Nosler once when I had a .270. I asked him what he liked better for elk. The AB, or Partition. He didn't hesitate for a nano second, and said the Partition.
I would go with the model 70 .270 hands down but Im just a bit partial to model 70's and .270's I would also pick it because of the Leupold scope on it because in my experience they can take a hell of a beating and still be dead on. The .264 has always interested me but I have never owned 1 and I think yours would be on the heavy side for packing in the mountains. I agree with you on the remington safety. I had 1 go off on me years ago when I touched the safety and Im kinda gun shy of them. I do have a model 700 .270 that has been a great gun (its not the 1 that went off) but I havent used it much since I got my model 70 .270
I think the one you feel more comfortable with, what I'm more curious about is the safety issue you mentioned with you rem?
The safety issue is that when I carry a rifle on a sling I switch shoulders with it at times due to terrain or fatigue. When I carry a right handed bolt gun over my left shoulder the straight slide safety can rub into the fire position against my pack. Even with the chamber empty this lets the bolt rub open and exposes the chamber to debris. Probably would never happen without a pack, or maybe even with a narrower pack. The 3 position safety like an M70 or Ruger M77 has locks the bolt in the rear position and the safety has to swing all the way around to hit fire, so this isn't an issue. Tang safetys work good also, but some don't lock the bolt in the rear position.
I really like the safety in the bolt like the model 70. Its much more reliable then the ones like the 700.
I'd go with #3 since its the lightest rifle and very accurate.