INCREDIBLY IMPORTANT NOTE: If you do not care about 3D speed on your second monitor, and need to run at resolutions at 1200x1600 or above, the Matrox G450 PCI is for you, at around $95. If you do not care about 3D speed and run below 1200x1600, the Matrox G200 PCI is for you, at around $40 shipped. You cannot beat the 2D quality on these video cards.
-Chu