Multiple Graphics Cards (Dual Monitor + HDTV)

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That would work if you can find one where the HDMI doesn't cancel out the DVI. Mine has both but I can't use both at the same time.

OK, so you mean I should replace my current graphics card with one with DVI, VGA and HDMI? I was wondering if I could buy one to use only for HDMI, parallel to my current one.

I don't think you have to mirror anything. And I think mirroring would defeat your purpose of having three monitors, to use separately.

Yes, but I was thinking of using it for displaying for example video clips, photos and things on my TV, and therefore it would be simpler to just mirror one of the monitors because that would be easier to control with the computer.