So I am going to be buying a new Mac soon. I am very much liking the new iMac G5 and was going to buy the 17" 1.8 GHz model. But now I see that Apple has some more 1.6 GHz G5 PowerMacs for a good price, and the expandablility of the PowerMac is intriguing. My question of course is which will be faster. Does the 1.8 GHz win no matter what, or Does the faster bus speed of the PowerMac make them about the same?