My brother-in-laws have Sakos and they are absolutely great rifles, but then again so are Rem. 700's. You already have 3 700's, why not try a Sako, I don't think you will be dissappointed. As far as caliber, depends on what you wanna hunt with it. It is really hard to beat a 270, it is by far one of the "killingest" rounds ever developed. They are super fast and shoot really flat. Unless you are planning to use this gun for moose and bear, the 270 will do you justice for everything from antelope to elk. Think about how versatile the 30-06 is and always has been, the 270 is pretty much a .277" bullet sitting in a necked down 30-06 casing. I also love the 300 Win Mag, I've used this more than any other caliber. If you absolutely need one gun to kill anything that walks in North America, then go with the 300 Win Mag. If it will be more of a deer/elk gun, I like the 270. Just my 2 cents worth!!