I'm looking at a 27" 2560X1440 monitor for my '09 (flashed to 5,1) Mac Pro. Should the standard equipment graphics card with 512MB work OK? Using for photography (Photoshop, Canon software), movies. Currently using a 23" Acer at HD res. Will soon be doing 3D modeling, gaming, light video editing but nothing heavy duty. If an upgrade is needed, what's a cost effective way to go? Thanks in advance for any insights.