| Hello,
I would suggest an ATI card, they are good, but there are so many others... I'm sure there are many well-priced ones. Just remember sometimes they may have conflicts with each other (your old one and new one) or the mother board may not support it if the board is too old. I'm not really sure about the compatibility thing, so I would suggest asking someone who can really tell you what will work, etc.... maybe someone here at Ask Me Help Desk can reply to this message and give you exact hardware that would work.
Also, many new video cards are compatible with operating two monitors, but they need to have two monitor outputs. You may just be better off buying one of these, since it is designed to support two monitors, but I would assume they may be quite expensive. Perhaps someone else here at Ask Me Help Desk can give us some suggestions, too.
Hope this helps! | 
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