Hi I currently have one 19" Samsung monitor connected to my iMac via the Mini-DVI. I am looking to get another monitor hooked up, but of course there aren't any more video ports. Are there any alternatives? to have two monitors connected to my iMac? I have heard of the DualHead2Go product, and possibly connecting via USB? I would appreciate any help on the matter, any info on the above and if there are any other methods. Thanks.