He is asking about running
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He is asking about running more than one monitor off his computer.
Its up to you, but I like matching screens. The dual monitor thing works best when both monitors are set to the same resolution so I would say find one like you have. Most good video cards have dual outputs anymore, some 2 vga or vga and dvi and many times they come with a dvi to vga adapter. Im using a gforce 7300gs,its a fairly budget (like 70$ I think) card but runs 2 monitors just fine. The more you spend the faster card you get, so its all up to your budget. I often watch a movie on one screen while working on the other. It is also is much easier to do video editing on 2 screens. You not stuck with the little preview window, you can use the 2nd monitor for a full screen preview.