What graphics card would be the best for setting up multiple monitors? (4+)?

I've been looking at video cards for a workstation my uncle needs built so that he can trade stocks/other shazz across multiple monitors (4+). I've found a couple but have been inconclusive in deciding which was best for trading/having multiple monitors. What specs should I be looking at and is anyone here a trader with multiple monitors?|||The nVidia Quadro NV440 supports up to 4 monitors, capable of driving each one independently. It is available as a PCIExpress 16x card. That's the one I'd use.|||Ati Technologies HD4870 and two KMV units translates into eight TVs or monitors.