Thanks for the advice and reassurance. Looks like it's a go!
Quote from WinstonTJ:
these are dirt cheap and can be had easily. I highly reccomend them.
http://shop.ebay.com/?_from=R40&_tr...kw=Matrox+g450+dual&_sacat=See-All-Categories
Buy two so you have a backup - Just make sure you have the appropriate PCI/PCI-e slot on your computer. Drivers will pull down from a Windows Update (except for Vista x64 and XP x64)
Windows can support up to 9 monitors so I assume that your Dell/HP will have an integrated video card on the motherboard - just buy one of these, plug it in, do windows updata, restart a few times and then go to display settings in the control panel and enable the monitors, etc.
Cheap & easy 3 monitor solution.