Which graphics card do I need for a setup with a Dell U3011 (30" @ 2560x1600), an LG 29EA93 (2560x1080) and a third standard monitor at 1980x1200? I have a upgraded mac pro 4.1/5.1. Looking at the standard apple ATI 5770 but I'm not sure it can do the two higher resolution monitors? Not doing heavy graphics work on this, just need lots of screen realestate. Thanks!