Stiller brand actions. I think the Predator model is made for hunting. I have not used one yet but from all reports it is a very nice action for the price. It's based off the Rem 700 and fit Remingtons stock, but the action is much more refined. Stiller is known for making benchrest actions.
I had two Montana Rifle Company actions. (Long story there) While most people liked them I had a lot of trouble with both of mine. The action was also very roughly finished and not very square. It was also a very heavy action. Resale was also very poor. Unless you are building a left handed dangerous game rifle, I would look elsewhere.
You'll get much better value going with a custom action from Stiller or Nesika and good smith. Also, you'll get an excellent product you don't have to worry about.