I have 10 PC's running ASUS P6X58D-E since last May 2010 -> http://www.newegg.com/Product/Product.aspx?Item=N82E16813131641
I also have HD 5770 and they can support (3) monitors all with digital: 2 x DVI, 1 x DisplayPort. Otherwise nVidia limits with (1) GPU to (2) monitors. The GTX 560 and GTX 570 are also very good and run games, movies, etc very well.
edit: GPU --> nVidia: EVGA or ASUS, ATI/AMD XFX - both have Limited Lifetime Warranties.