I'm going to be ordering a Mac Pro with the Radeon X1900 XT later this month. It will be replacing my iMac Core Duo and supplementing my MacBook. Now that I'm working with Aperture and Final Cut Express (editing HDV), I'm feeling the need to upgrade to something more powerful. Someone else will be putting $3000 toward this system, but I'll still need to buy a display and at least 4 GB of RAM, so I'm still expecting to put down a decent chunk of change. This system will need to last me for a few years, and I'm wondering how much of an advantage the 3.0 GHz Woodcrest will have over the 2.66 GHz version. Is the extra performance worth $720, particularly in the context of continued productivity 3 years from now?