Video card for Gateway GT5692?

I want to run dual monitors (22" each) and am looking for a video card that fits my computer and will have two DVI spots. My main problem is I don't know what will fit in my computer. I am not really a gamer, but just watch lots of videos and stuff like that. Thanks for the help.|||PCI-express; but with only a 300 watt power supply, that might be asking for problems.