I have read that DVI design was pretty crap as far as cable length went - not designed by a broadcast engineer wink
HDMI is better (dunno why) - but most HTPC systems use DVI->HDMI and 10m is pushing the length.

Having said that my 10m DVI->HDMI cable is fine.

ah yes, here it is:
http://www.bluejeanscable.com/articles/whats-the-matter-with-hdmi.htm
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LittleBlueThing Running twin 30's