I bought a 12m dvi-d cable from cablesolutions in the states. It works a treat from my HTPC to a sony hs20. No sparklies. They do a range of sizes up to 15metres. They also trade on ebay.Which is where I found them after losing out on a 10m bettercable one ( production meetings happen at the most inconsiderate times) total price including shipping was $177 dollars plus 30quid on top for tax and duty Hope this helps for those of us trying to run long DVI lengths and balking at the costs involved for reliable cables and extention systems.