Go to your local sporting goods store and actually hold the item and get a feel for it and see what the price is there. I think you are looking for a model 700 BDL. Remington has been making these for years and it is a good rifle. Not the best and not the worst, but very functional and has a proven track record.
I think the .300 RUM is too much for what you have indicated you are looking to hunt. When you go to the sporting goods store, open up a box of .300 RUM cartriges and then look at a box of '06. That may help you with your choice of calibers.
After visiting your local store you will know whether gunbroker.com is a good deal for you or not. Remember that rifles purchased on the site have to be shipped to someone that holds a FFL license. They will charge you to do the paperwork and the background check. You have to add those costs into the price of the rifle as well.