I have not owned the Remington yet. And I have not seen the price. I have owned, DPMS, BushMaster, Rock River, and shot the S&W. Our experience is that the Rock River's are the most accurate of the bunch. To me accuracy is key in these rifles.
The Rock River shot the best group. The only one I was disappointed in was the BushMaster. We had two of them that I would not take a 300 yard shot with. Accuracy was poor. However these were not the Varmint HB models(to be fair).
Below is a picture of a 300 yard group off the bench with Black Hills factory ammo. I shot this with the Leupold VH reticle, and a slight left to right wind. This is the best group I have shot. But all the groups are pretty close to this one. Tom.