30 feet... Ouch - that's close to twice the DVI standard's distance limitation of 5 meters.
I've had good luck with the few Blue Jeans Cables in my system, and as listed
here they offer a return policy that should be familiar to gunslingers around here - it's the same policy used by Outlaw, 30 days no questions asked.
The DVI cable I have running from my HD cable box to my display is from
Pacific Cable . It's a much shorter length than you are considering, at only 2 meters, but the cable I have is well made and their prices are very good for lengths up to 5 meters. On the other hand, the
10 meter length they offer costs $110. That's actually higher than Blue Jeans.