My current machine is a 2007 17" MBP 2.4Ghz that I run in lid-closed mode at the office with a 30" ACD for display. I run an eCommerce business and am looking at upgrading to a new Mac Pro and dual 30" setup for more screen real estate. I am not sure whether it would be better to start with one 5870 or two 5770 video cards to run the dual 30" monitors. Both options are about the same cost ($200 vs $250) and can power both displays. From what I have read on this forum about the 5870, it seems to offer better gaming/3D rendering performance. Some have suggested that two cards are better for multiple monitors, but I am fairly sure that they were referring to a 3+ monitor setup. I doubt I will ever need more than two 30" monitors, but you never know. If I went with one 5870, could I add a second in the future? I don't do as much gaming as I used to (too busy) but I might get back into it casually some day. The setup I am contemplating is a 3.3Ghz 6-core or 3.2Ghz 4-core with base RAM and HDD, then upgrading to 10 or 12GB RAM and a SSD boot disk. Any suggestions are appreciated. Thanks!