depends on what your latency requirements are
you can try a decklink card if you dont need low latency
you can also try intensity card with hdmi straight from computer - but hdmi can be very tricky to set up
and only some computers like outputting at a resolution which is compatible with decklink hdmi - they only work at certain screen sizes set by hdmi edid
you have to test these things yourself
you can also try these:
http://www.blackmagic-design.com/products/dviextender/
to convert to sdi
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i dont use dvi2usb so i dont know how well they work