Ok I don't know what you are spicifically asking. I'll explain Crossfire, Dual Moniters, and chipsets.
Ok, You want to get a X1950pro. It's a great midrange graphics card for gaming. The card has two DVI connectors on it. So you could plug in two LCD's into the card. Crossfire is using two ATI graphics cards to render graphics together. (Two cards are better than one) So you need two identical ATI cards and a motherboard that supports it. ATi's Xpress 3200, an Intel's 975x both support Crossfire. According to this AnandTech article
the Asus P5B Deluxe supports Crossfire.
You are not looking for Crossfire (I think). If you want a dual monitor setup, You can simply plug the two LCD's into the X1950pro. If you're still confused just ask any questions you still have.