We have one of those big ol' Kings they sell at Tractor Supply. 120 pound hopper so it'll easily take 3 bags at one shot.

Be aware that 'rated for 2000 feet' will not mean that 2000 feet will be evenly heated. You'll be tolerable at the extremities and roasting the closer you get to the stove itself. You'll want to factor in some method of air flow to draw that heat away from the stove and into the far depths of your house.