Never heard of Bergara. It looks like a nice rifle and a good price. I see they have the option of using the Magpul mags, so that's a plus.
I have a R700 in .308 WIN. It's the factory Magpul edition and I like it, but I've never had it out very far so I can't say it's an obvious winner of the 3 you listed. I got an amazing deal on it.
If you have Ruger Precision Rifle money I'd say go for that. It has a few clear advantages over the other two, and Ruger has a great track record for accuracy and build quality -- something I can't really say about Remington since they were bought up by Freedom Group in 2015. Ruger wins in my opinion.