Extended DVI cable run, 30-inch Cinema HD Displays

Looking through various sites selling DVI-related gear, I see a number of products for extending the cable length for DVI video signals at up to 1920 x 1200 resolution. We are about to receive an a Quad G5 system with the Quadro FX 4500 driving two 30-inch Cinema HD Displays, with 2560 x 1600 resolution. Is there any product that will extend the default cable length for such a display at its native resolution, even if the added distance is less than that offered for lower-resolution displays?
TIA,
Joe Gurman
Quad G5 2.5 GHz   Mac OS X (10.4.6)   2 x 30-inch Cinema HD

This;
http://www.gefen.com/kvm/cables/appledlcombocable.jsp
or this;
http://www.gefen.com/kvm/product.jsp?prod_id=2938
depending on how far you want to extend the cable.

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