Like everyone I love a new mac , and I have been toying with moving onto a mac pro from a MBP since I will be doing more graphic/video intensive work - movie/episode length video editing, motion graphics etc. However, I am curious how long would the current gen of Mac Pro last in reality? I am looking at the 2.66 Ghz, would I be able to upgrade the CPU sometime down the road to a higher Ghz? Or would they even be build? Seems like with Intel moving onto 45nm architecture... I would imagine those would require a different motherboard. Seeing how even the current iMacs suppasses the Dual G5, I am a bit hesitant to get a Mac Pro to only be obsolete in speed in 2 or so years. Not to mention the discussions about the lack and expense of upgrading a Mac Pro. What about the expected new Mac Pros for next week? What would be the expected life expectancy for them be? I just don't want to get these powerful machines to only be beaten by the iMacs in 2 years or so....may as well get the iMac in the first place and update every 2 years.