I like the 300 win mag. That is my personal preference only. Any of the calibers that you listed should do fine. I have used my brothers Rem 700 chambered in 300 win mag for many years, and finally bought one for myself last spring. After much research I went with the Rem 700 5R Milspec in 300 win mag. I had some trouble with it the first time out (broken extractor on the 3rd round) but after having a sako extractor installed it has been good to go. I have only put factory ammo through it at this point, and it has shot sub moa with eveything I have used. Next on the priotity list is a muzzle brake
. From there it is on to hand loading and working up some loads. I am interested in loading the Berger 230 gr OTM bullet, the Nosler 210 gr Accubond bullet, and the Nosler 215 gr Accubond LR bullet when it is available.
I'll stop now, I really didn't mean to go on and on.