best hardware for dual screening

I am looking to hook up a dual screening arrangement (possible triple but lets go with double for now) and want to know whats the best hardware for the job.

I have seen the Triton USB video adaptor -

I think Mator does one -

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nathan1038Author Commented:
I would also like to know what i need to do this - If I use the USB product do i still need a video card that can dual screen !

Any video card from 30US$ and upwards will support two output channels (DVI+DVI or DVI+Sub-d).
I would say an actual video card with the dual outputs is the way to go unless you are on a laptop where you don't have the luxury of easily replacing the card.  Make sure that you get a card that can handle your graphic needs.  If you are into graphics, multi-media or gaming  i wouldn't skimp out on the itme that you choose.  

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