dual link DVI-d video cards (for 30" Dell LCD)

[D. Hugh Redelmeier]

Dell recently announced what looks to be a gorgeous 30" LCD.  The 
resolution is 2560x1600.  This is beyond what normal DVI can handle.  The 
monitor requires "dual link" DVI-D.
http://www1.us.dell.com/content/products/productdetails.aspx/monitor_3007wfp?c=us&cs=19&l=en&s=dhs

Does anyone have a recommendation of how to find a suitable video card?  
The Dell page mentions some of their cards. I've spent a bit of time 
looking at card specs.  Few mention dual link, even for cards that I've 
been told support it.

I guess that most such cards will have lots of features that will not be 
used by me (I hope to only use Open Source drivers).  I'd like to find one 
that doesn't cost more for features I won't use.