If you don't need anything huge to play games and such I highly recommend these Matrox G550s.
http://www.newegg.com/app/ViewProduc...106-160&depa=1
We have about 10 of these for the office and the DVI is flawless. No unwanted shadows or distortion on the second monitor after 2+ years of use. Surely someone else can vouch for these cards
