Rowe makes a 3200A that would be the same size as the 2800 that you currently have, and it has 4 validators in it. They come standard with 500 note stackers, but you can upgrade them to 1000 note stackers.
Height: 38.62 inches (98.11 cm)
Width: 12.06 inches (30.64 cm)
Depth: 18.25 inches...