I purchased a new iMac (3.06GHz) recently as an upgrade to my 2GHz PM G5 which is just now getting a bit long in the tooth after almost 5 years. I am a little concerned about the iMacs longevity compared to a new mac pro as I have no history with an iMac. The iMac fits my computing needs but its all about the longevity for me as I don't upgrade very often. I can still return the iMac (and take a hit) and go with the Mac Pro but I must do this today. Am I concerned for nothing? Thanks for the feedback.