I ordered the following in 12ft and 6ft. I'll let you know how they are.
12 ft Dual-Link DVI CAble for ~$35:
The PureAV™ DVI Dual-Link Cable from Belkin® delivers the high performance and bandwidth needed true HDTV resolution using dual-link construction. DVI Dual Link transfers data in pure digital form, and reduces cross talk with impedance-matched, twisted-pair construction. It creates virtually precise contact and enhanced durability with corrosion-resistant, 24k gold connectors and ground indents. The triple-layer shielding provides good isolation from electromagnetic and radio frequency interference. The molded-strain relief mechanism prevents wire damage and ensures high reliability. This 12-foot, 24-pin cable is an ideal option for use with your HDTV / digital satellite receiver, plasma TV, LCD TV or monitor, progressive-scan DVD player and digital projector.