AGP dual display card + PCI card

hi, wonder if anyone can help me out with this:

i'm currently running xp pro with a dual display graphics card nVidia FX5200 (for 2 crt monitors with spanned desktop.
i would like to add an additional grpahics card (PCI) to my system to allow me to add another monitor. i intend to get a card with the same chipset, so the drivers are the same, and have done this before with single head graphics cards fine. the problem is that i have never done this with a dual head card.

can you have multiple dual head graphics cards in xp pro? or even a dual head card and a single head PCI card? and does this allow desktop spanning (if the drivers allow it)?

any help would be very much appreciated.

thanks.