I have a Dell D600 laptop (with Mobility Radeon 9000) and two 17-inch LCDs.  How do I get a triple display system out of this?  I want to use all 3 displays and have each be a separate monitor (even if something like UltraMon is necessary).  I also use a port replicator / docking station (Dell PR01X), which has 1 VGA output and 1 DVI output.  I'm assuming I can't use both the VGA and DVI outputs at the same time AND the laptop display.  I looked at the Matrox DualHead2Go, but it just makes it so the 2 LCD monitors would be seen as 1 big widescreen monitor, so I can't really use them as 2 separate displays.  What's the least expensive way for me to get usage of all 3 displays (as separate monitors)?