I am about to custom build a new pc. For starters it will run amd's 3.30ghz 6 core processor, a radeon 5870, and 12-16gigs of tri channel ddr3 ram. I do alot of 2d design (adobe photoshop, fireworks, flash, premiere pro, and after effects. As far as 3d design ( Autodesk Maya, Pixologics Zbrush, and headus uv for uv layouts. I do not game heavily on my pc but when I do it will be something such as a mmo like maple story or Battlefield 3 when it comes out. Regardless I want to get the most out of my pc's power and my question here is the OS. Do you think I should run Windows XP 64bit or Windows 7 64bit?