video card help?

im sure this type of questions has been on this forum many a times but i just want to make sure.

i want to hook up two LCDs and one CRT. the originial video card that was on my comp's motherboard does not work anymore so i bought a cheap AGP video card with 1 dvi port and 1 vga port.

now can i simply add another pci slot video card with 1 dvi port and all should be fine? because i have heard that you need to be using the original video card the computer came with if you want to use additional PCI video cards on top of it.

then what do i do from here, in terms configuring my windows XP settings so i can use all 3 monitors?